B.27 Ductwork - VN - Centrepoint

DUCTWORK

The English language version prevails. u tin ting Anh khi c tranh ci.

Centrepoint Page 1 of 17 of B.27 18 September 2007

DUCTWORK H THNG NG GI

1 GENERAL 1 TNG QUT

1.1 FUNCTIONAL DESCRIPTION 1.1 M T The ductwork scope of works covers all ductwork necessary to meet the air conditioning and mechanical ventilation requirements of the project and the variable air volume units (VAVs). Ductwork has been sized on velocities to ensure a reasonable acoustic level in the spaces as well as a reasonable pressure drop. Air grilles are based on standard fittings as are usually available in Vietnam. Note that type testing of grilles is required to ensure that the required acoustic performance is met.

Phm vi cng vic h thng ng gi bao gm tt c cc ng gi cn thit p ng yu cu ca h thng iu ha khng kh v thng gi c kh ca d n v cc hp VAV. ng gi c tnh li kch thc da trn tc gi m bo mt n hp l trong khng gian lm vic cng nh l c st p hp l. Ming gi c da trn cc ph kin tiu chun ph bin ti Vit Nam. Yu cu phi c th nghim mu ca ming gi m bo hiu qu cch m c p ng.

1.2 CROSS REFERENCES 1.2 THAM CHIU CHO

General Comply with General requirements worksection.

Tng qut Ph hp vi chng Nhng yu cu chung.

Related worksections Refer to the following worksections: Mechanical General Requirements, Metals & Prefinishes, Adhesives, Sealants, Fasteners, Acoustic & Vibration Control, Air Handling Plant, Packaged Air Conditioning, Fans, Air Filters, Mechanical Commissioning

Nhng chng lin quan Nhng yu cu chung v c kh, Kim loi & Hon thin s b, Keo dn, cht trt kn, ph kin kp cht, Kim sot n v rung ng, H thng Thit b x l khng kh, H thng My iu ho n l, H thng Qut, H thng Lc gi, Chy th v Nghim thu cc h thng c kh.

1.3 STANDARD 1.3 TIU CHUN

General Ductwork: AS 4254.

Tng qut ng gi: AS 4254

Proprietary and non-standard systems Conform to functional criteria in AS 4254.

H thng nguyn b ch to sn v khng theo tiu chun Tun th cc tiu chun hot ng trong AS 4254

Microbial control To AS/NZS 3666.1 and the recommendations of SAA/SNZ HB32.

Kim sot vi khun Theo AS/NZS 3666.1 v cc yu cu trong SAA/SNZ HB32.

2 QUALITY 2 CHT LNG

2.1 PRE-COMPLETION TESTS 2.1 TH NGHIM TRC KHI HON TT

Accessory production tests Variable air volume boxes: Test fan motor assembly. Test volume dampers, wiring and controls. Check sequence of operation and preset air volume rate before shipment.

Th nghim sn xut cho ph kin Hp VAV: th nghim cm mt qut. Th nghim van chnh lu lng, dy ni v chi tit iu khin. Kim tra trnh t vn hnh v t l gi ci t trc trc khi xut xng.

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2.2 SAMPLES 2.2 VT T MU

Air grilles Submit a sample of each type of air grille.

MING GI Trnh duyt mu ca mi loi ming gi

Flexible duct Submit sample 2 metre length of 300 mm diameter flexible duct with sheet metal spigot attached.

ng gi mm Trnh duyt 2m chiu di ca ng gi mm c ng knh 300mm vi ai ni bng thp tm.

Access doors, volume dampers, fire dampers etc Submit samples of all access doors, volume dampers, fire dampers etc.

Ca thm, van gi chnh lu lng, van gi ngn chy, Trnh duyt mu ca tt c cc ca thm, van gi chnh lu lng, van gi ngn chy.

2.3 SUBMISSIONS 2.3 TRNH DUYT

Shop drawings Submit shop drawings showing ductwork and grilles, co-ordinated with other services, and showing duct flanges, segment lengths and tag numbers, hangers and hanger locations.

Bn v thi cng Trnh duyt bn v thi cng th hin ng gi v ming gi, phi hp vi cc h thng khc, v th hin mt bch ni ng, chiu di cc on v s th, chi tit treo v v tr treo ng.

Product data Submit type test data as follows: - Air diffusion equipment: Acoustic

performance to BS EN 5135. - Duct attenuators: Broad band insertion

loss and generated noise level to AS 1277.

- Acoustic louvres: Sound transmission loss to AS 1191.

Thng tin sn phm Trnh duyt kt qu th nghim mu nh sau: - Thit b khuych tn khng kh: c

tnh n theo BS EN 5135. - ng gi gim m: c st m di

rng v n pht sinh theo AS 1277.

- Ming gi gim m: st m theo AS 1191.

Duct fire rating systems Certification: Submit test certificates showing compliance with AS 1530 for fire resistance.

H thng ng gi chng chy S chng nhn: trnh duyt giy chng nhn th nghim th hin s ph hp vi tiu chun AS 1530 v chu la.

Fire and smoke dampers Certification: Submit test certificates showing compliance to AS 1682.1 for air leakage and fire resistance. Closure: For positions where dampers cannot be installed to close in the direction of the air flow, submit proposed installation details.

Van gi ngn khi v ngn chy S chng nhn: trnh duyt giy chng nhn th nghim th hin s ph hp vi tiu chun AS 1682.1 v r kh v chu la. ng kn: i vi cc v tr m van gi khng th lp t ngay chiu thi khng kh, trnh duyt chi tit lp t.

Access panels Submit proposed alternative sizes, if any.

Ca thm Trnh duyt cc phng n kch thc chn la, nu c.

System resistances Submit caluculations on system resistance, including a contingency factor. Calculations to be based on dirty filter conditions. Submit fan curves showing system curve and fan discharge performance under dirty and clean filter conditions.

Tr lc ca h thng Trnh duyt cc tnh ton tr lc ca h thng, bao gm mt h s bt thng. Tnh ton phi da trn trng thi lc gi b d. Trnh duyt ng c tnh qut th hin ng c tnh h thng v hiu sut y ca qut di iu kin lc gi d v sch.

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3 DUCTWORK 3 CNG TC NG GI

3.1 SHEET METAL 3.1 THP TM

Material Galvanized steel duct and mild steel components < 3 mm thick: Prime quality lockforming galvanized steel, Grade G2 or G3 to AS 2338 with Z275 coating to AS 1397. Components for stainless steel and aluminium ductwork: Use materials with corrosion resistance not less than that of the duct wall material.

Vt liu ng gi thp trng km v cc ph kin thp mm dy < 3 mm: thp trng km lm kha cht lng tt, mc G2 hoc G3 theo AS 2338 c lp m Z275 theo AS 1397. Cc cu kin bng thp khng r v ng gi nhm: s dng vt liu c chng n mn khng thp hn vt liu lm thnh ng gi.

Fasteners Rivets: Expanding solid end type, aluminium base alloy for galvanized duct, stainless steel for stainless steel duct, minimum size as follows: - For sheet metal to sheet metal: 3 mm. - For sheet metal to supports, brackets

and rolled steel angles: 4.8 mm. Self tapping screws: Zinc-plated for galvanized duct, stainless steel for stainless steel duct. Self drilling and tapping screws: Zinc-plated for galvanized duct, stainless steel for stainless steel duct. Provide only if base material into which they screw is thicker than 1.5 mm, and they are unlikely to be removed or replaced. Bolts, nuts, washers and drop rods: Zinc-plated steel, service condition number 2 for galvanized duct, stainless steel for stainless steel duct. Parts on stainless steel duct not in contact with air stream or corrosive conditions may be zinc-plated as for galvanized duct. Provide washers under nuts and bolt heads.

Ph kin kp cht Riv: loi u cng n to, hp kim nhm cho ng gi trng km, thp khng r cho ng gi thp khng r, kch thc nh sau: - i vi bt tm kim loi vi tm kim

loi: 3mm - i vi bt tm kim loi vo chi tit , bt treo v thp gc: 4.8mm

Vt t ren: m km i vi ng gi trng km, thp khng r i vi ng gi thp khng r. Vit t khoan v t ren: m km cho ng gi trng km, thp khng r cho ng gi thp khng r. s dng ch khi vt liu nn m n bt vo dy hn 1mm, v c th khng cn tho ra hoc thay th. Bulon, ai c, vng m v thanh treo: thp m km, ch lm vic s 2 cho ng gi trng km, thp khng r cho ng gi thp khng r. Cc chi tit trn ng gi thp khng r m khng tip xc vi dng khng kh hoc cc ch n mn c th s dng loi trng km, hoc m km. s dng vng m bn di u bulon v ai c.

Duct sealing Seal ducts in accordance with AS 4254 clause 2.2.1 and the Duct seal class table. Sealant materials: Use only sealants that: - Do not foster microbial growth. - Have a smoke developed index 3

and a spread of flame index 0 when tested to AS/NZS 1530.3.

- Will maintain their sealing performance for the life of the duct system.

Adhesive duct tapes: Use only as a secondary sealant on joints sealed by other means such as mastic or gaskets. Do not use duct tapes for non-sealant purposes. Machine rolled flanges: Use mastic at

Lm kn ng gi Lm kn ng gi theo tiu chun AS 4254 im 2.2.1 v Bng phn lp lm kn ng gi. Cht trt kn: ch s dng cc loi vt liu - khng to s pht trin vi khun - c ch s sinh khi 3 v ch s chy

lan 0 khi th nghim theo tiu chun AS/NZS 1530.3

- c tui th ca hiu sut v c tnh nim kn bng vi tui th ng gi.

Bng keo dn ng gi: Ch s dng nh l mt vt liu lm kn th hai trn cc mi ni lm kn bng cc vt liu khc nh bt trt mastic hay c m. Khng s dng bng dn cho mc ch khng phi lm kn. Mt bch cn my: s dng cht trt kn

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corners. cho ng gi cc gc. Duct seal class table Bng phn lp lm kn ng gi.

Seal class to AS 4254 Table 2.2.1 Phn lp lm kn theo AS 4254 bng 2.2.1

Supply ducts ng gi cp

(Static pressure classification Pa)

(cp p sut tnh Pa)

Duct location V tr ng gi

500 > 500

Exhaust ducts

ng gi thi

Return ductsng

gi hi

Outdoors/ Ngoi tri A A A A Unconditioned spaces/ Khng gian khng c iu ho

B A B B

Conditioned spaces (concealed ductwork)Khng gian c iu ho (ng gi lp m)

C B B B

Conditioned spaces (exposed ductwork) Khng gian c iu ho (ng gi lp ni)

- Office-type spaces - vn phng

A A B B

- Factory-type spaces - nh my

C B B B

3.2 EXPOSED DUCTWORK 3.2 NG GI LP NI

Material As per Ductwork Sheetmetal on formed metal helix. Do not use adhesives.

Vt liu Theo phn kim loi tm ca cng tc ng gi trn ng xon kim loi nh hnh. Khng c dng keo dn.

Installation As per Ductwork Insulation (25mm internal acoustic) with the exception that perforated metal to be used in lieu of pins.

Lp t Theo chng Cch nhit ng gi (25mm cch m bn trong) ngoi tr s dng kim loi c l thay cho cht.

Painting Comply with Painting. Colour to match ceiling (white, refer to arch. schedule for exact colour).

Sn Tun th chng Sn. Mu sc tng xng vi trn nh (trng, tham chiu bng lit k ca kin trc s bit mu chnh xc.

3.3 FLEXIBLE DUCT 3.3 NG GI MM

Material Uninsulated flexible duct: Alumidised fabric clamped on formed metal helix. Do not use adhesives. Insulated flexible duct: As for uninsulated flexible duct with 25 or 40 mm thick glasswool blanket insulation wrapped around duct and covered with an outer vapour barrier.

Vt liu ng gi mm khng bc cch nhit: tm vi nhm kp trn ng xon kim loi nhm nh hnh. Khng s dng keo dn. ng gi mm c bc cch nhit: nh ng gi mm khng bc cch nhit vi lp cch nhit tm len thy tinh dy 25mm hoc 40mm qun xung quanh ng v c bao che bng lp o chng hi m.

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Installation Install flexible duct as straight as possible with minimum number of bends. Maximise bend radius but not less than AS 4254 clause 2.8.5 (h). Joints: Join lengths of flexible duct only for the purpose of providing an air tight or acoustic sleeve at a partition. Support: To AS 4254. Install to limit sag to maximum in AS 4254. Maximum length of flexible duct sections: 4 metres including any rigid duct or sleeves used to join lengths of flexible duct. Flexible ducts used for air containing free moisture: Locate supporting helix outside airstream.

3.4 KITCHEN EXHAUST DUCTWORK

Standard To AS/NZS 1668.1 Section 1. Construction Ductwork: Do not crossbreak. Grading: To AS 4254 and AS/NZS 1668.1. If stainless steel is required then Type 321 shall be used. Joints: Seal to AS 4254 clause 2.2.2. Access: Provide liquid-tight cleanouts to AS 4254 and in addition at: - The bottom of kitchen exhausts

risers. - Sprinkler head locations. Drains: Provide a grease gutter and DN 25 drain socket and plug - at the lowest point of each run of

ducting; and at the bottom of vertical risers.

Lp t Lp t ng gi mm thng nht c th c vi s ln b cong ti thiu. Bn knh b cong tng ti a nhng khng ln hn theo AS 4254 clause 2.8.5 (h). Mi ni: mi ni di ca ng gi mm ch c nhm mc ch to ra s kn gi hoc lm ng gim m cc vch ngn. Chi tit treo: theo AS 4254. Lp t sao cho vng gii hn theo gi tr ti a trong AS 4254. Chiu di ti a ca cc on ng gi mm: 5 mt bao gm ng gi cng hay ng lt ni hai on ng mm. ng gi mm s dng cho khng kh kh: nh v ng xon treo bn ngoi lung khng kh.

3.4 NG GI THI NH BP Tiu chun Theo AS/NZS 1668.1 Section 1. Cu to ng gi: khng phn nhnh ng gi giao nhau. Phn loi: Theo AS 4254 v AS/NZS 1668.1. Nu yu cu l thp khng r th s dng loi 321. Mi ni: hn kn theo AS 4254 khon 2.2.2. Li thm: ngn cht lng heo AS 4254 v trong iu kin sau: Phn y ng thi xuyn tng V tr u prinkler X: cung cp mng hng m v ng DN25 ti im thp nht ti mi on ng v ti y ng ng thi xuyn tng

3.5 FIRE PROTECTION OF DUCTWORK

3.5 BO V CHY CHO NG GI

Composite panels or ducting Type: Calcium silicate and vermiculite composition board system to AS 1530.4.

Tm composite hoc bao che Loi: h thng tm Calcium silicate v vermiculite composition theo AS 1530.4

Sprayed coatings Type: Vermiculite spray system to AS 1530.4, with additional cement hard set finishing coat in locations requiring protection against damage or water.

Sn phun Loi: h thng phun vermiculite theo AS 1530.4, vi lp hon thin cng c b sung bt than trong cc v tr yu cu c bo v chng h hng hay nc.

Access Fire damper access: Where access is required to the duct interior such as at fire damper access panels, damper quadrants etc., provide easily removable panels of fire rating equivalent to the duct.

Cc ca thm Ca thm cho van gi ngn chy: ni m c yu cu c th tip cn c bn trong ng gi nh np thm van gi ngn chy, tm canh gc chnh van gi,, lp t ca d tho c chu la tng ng vi ng gi.

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Exhaust fan access: For items such as smoke exhaust and kitchen exhaust fans that are too large or heavy to remove through access panels provide a fire rated enclosure around the item with fire rated doors or removable fire rated panels large enough to permit removal of the item.

Ca thm cho qut ht: i vi cc thit b nh qut ht khi v qut ht nh bp qu ln v nng c th tho qua ca thm, lp t mt khung bao chng chy xung quanh thit b vi ca chng chy hoc bng chng chy tho c ln d dng tho ri thit b.

3.6 FLEXIBLE CONNECTIONS 3.6 NG NI MM

General General: Isolate fans and conditioner casings from ductwork, by means of airtight flexible connections. Materials: Heavy duty, waterproof. Length: Provide sufficient slack to ensure free movement and vibration isolation under operating and static conditions. Alignment: Align openings of connected equipment. Fixing: Fix to attachments with zinc-coated steel strip. Seal joints. Do not paint flexible material. Fire protection: To AS 1530.4. Maintenance: Arrange to permit easy removal and replacement without disturbing ductwork or plant. Restriction: Do not protrude connections or frames into the airstream where this would be detrimental to the air flow.

Tng qut Tng qut: cch ly qut v v my iu ho ra khi ng gi, bng cc ng ni mm kn gi. Vt liu: chu ti nng, chng nc. Chiu di: tao ra chng cho cc dch chuyn t do v cch ly run ng trng thi tnh v trng thi lm vic. S ng trc: u ni ng trc ng gi mm vi cc thit b. G lp: lp t cc ph kin bng bng thp m km. Lm kn mi ni. Khng c sn ln vt liu n hi. Bo v chng chy: AS 1530.4 Bo tr: B tr c th d dng tho ri hoc thay th m khng lm nh hng n ng ng ng gi hoc trang thit b khc. S hn ch: Khng c t li cc mi ni hoc khung vo bn trong lung khng kh ni m chng c th gy bt li cho lu lng khng kh.

3.7 INSTALLATION 3.7 LP T

Arrangement Arrange ductwork neatly. Provide access to ductwork components which require inspection, entry, maintenance and repairs. Where possible arrange duct runs adjacent and parallel to each other and to building elements.

B tr B tr ng gi tht gn g. Cung cp cc ca thm cho cc cu phn ca ng gi ni c yu cu kim tra, thm kim, bo tr v sa cha. Ni no c th th b tr ng gi chy gn k v song song nhau v song song vi cc kt cu xy dng.

Spacing Provide minimum clear spacing, additional to duct insulation, as follows: - 25 mm between adjacent ducts. - 25 mm between duct flanges or upper

surfaces of ducts, and undersides of beams and slabs.

- 50 mm between ducts and electric cables.

- 150 mm between ducts and ground, below suspended floors.

Khng gian Cung cp khng gian trng ti thiu, cho lp cch nhit ng gi, nh sau: - 25mm gia cc ng gi lin k - 25mm gia mt bch ng gi hoc b

mt trn ng gi, vi cnh di ca v sn

- 50mm gia cc ng gi v dy cp in.

- 150mm gia ng gi v mt t, bn di sn treo

Cleaning During installation progressively remove construction debris and foreign material from inside ducts.

V sinh Trong qu trnh thi cng phi dn dp lm sch cc mnh vn thi cng v vt liu l bn trong ng gi.

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Drainage Provide drainage to AS/NZS 3666.1 at locations in ductwork where moisture may accumulate including at outside air intakes.

Thot nc To thot nc theo AS/NZS 3666.1 cc v tr trong ng gi ni hi m c th tch t li bao gm c cc im ly gi ti vo.

4 DAMPERS 4 VAN GI

4.1 DAMPERS - GENERAL 4.1 VAN GI TNG QUT

Location Provide balancing dampers at each branch duct or tee: - Splitter type: Use only for supply

branches up to 600 mm wide and with velocity in main < 10 m/s. Do not use on return or exhaust ducts.

- Opposed blade dampers: Use for

larger size supply and for all return and exhaust ducts. Locate in each branch.

V tr Lp t van gi cn bng mi ng gi nhnh hoc ng ba: - Kiu chia nhnh: ch s dng cho ng gi nhnh c kch thc n 600mm rng v tc gi bn trong ng gi chnh < 10 m/s. Khng s dng trn dng ng gi thi hoc ng gi hi.

- Van gi c cnh nghch: s dng cho ng gi cp c kch thc ln hn v cho tt c cc ng gi hi v ng gi thi. t ti mi ng gi nhnh.

Dampers on diffusers and grilles attached to flexible duct In tiled ceilings: Provide a balancing damper at the spigot take-off from the rigid duct. Where spigot at rigid duct is not accessible through ceiling: Provide opposed blade dampers (OBDs) behind the grille or diffuser.

Van gi trn ming khuych tn v ming gi gn km vi ng gi mm i vi trn ni, chia : lp t van gi cn bng u ni chia nhnh t ng gi cng. Ni no u ni ti ng gi cng khng th tip cn c trn trn: lp t van gi c cnh ngc pha sau ming khuych tn hoc ming gi.

4.2 VOLUME CONTROL DAMPERS

4.2 VAN GI CHNH LU LNG

General General: Provide dampers which are free of rattles, fluttering or slack movement, and capable of adjustment over the necessary range without excessive self-generated noise or the need for special tools. Face dimensions: Duct size. Connections: Mating angle flanged cross joints. Frames: 1.6 mm minimum thickness zinc-coated steel or 2 mm minimum thickness aluminium folded to form channel sections at least 150 mm wide and welded at corners. Dampers required to provide tight shut-off: Comply with Motorised dampers. Dampers in smoke-spill systems: Zinc-coated steel or stainless steel blades and frames.

Tng qut Tng qut: lp t van gi khng ku lch cch, rung, x dch do lng, v c kh nng iu chnh trong mt khong cn thit m khng t to ra ting n qu mc hoc cn phi c dng c c bit. Kch thc mt: bng kch thc ng gi. u ni: mi ni giao mt bch m dng Khung: thp m km dy ti thiu 1.6mm hoc nhm dy ti thiu 2mm gp li to thnh cc on rnh rng ti thiu 150mm v hn cc gc. Van gi yu cu phi ng tht kn: tun th van gi iu khin bng mt. Van gi trong h thng y khi: thp trng km hoc cnh thp trng km v khung.

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Blades Material: Zinc-coated steel, aluminium or stainless steel. Form: No sharp edges. Sufficiently rigid to eliminate movement when locked. Minimum thickness: - Zinc-coated steel and stainless steel:

. Single thickness blades: 1.6 mm.

. Double thickness blades: 1.2 mm. - Aluminium:

. Single thickness blades: 2.4 mm.

. Double thickness blades: 1.8 mm. Maximum length: 1,200 mm. If necessary provide intermediate mullions. Single blade dampers: - For single thickness blades: 600 mm

maximum length, 600 mm maximum width or 600 mm maximum diameter.

- For single thickness blades with 6 mm minimum edge breaks: 1200 mm maximum length x 175 mm minimum width.

- For double thickness blades: 1200 mm maximum length x 300 mm minimum width.

Multi-blade dampers: - For single thickness blades with 6 mm

minimum edge breaks: 1200 mm maximum length x 175 mm minimum width.

Cnh hng gi Vt liu: thp trng km, nhm hoc thp khng r. Hnh dng: khng c cnh bn. Cng trit tiu cc dch chuyn khi b kho. Chiu dy ti thiu: - Thp m km hoc thp khng r:

. Cnh dy n: 1.6mm

. Cnh dy i: 1.2mm - Nhm:

. Cnh dy n: 2.4mm

. Cnh dy i: 1.8mm Chiu di ti a: 1.200mm. nu cn thit th lp t cc thanh chn trung gian. Van gi n cnh: - i vi cnh n: di ti a 600mm,

rng ti a 600mm hoc ng knh ti a 600mm.

- i vi cnh n c cc cnh ngt on ti thiu mi 6mm: di ti a 1.200mm v rng ti a 175mm.

- i vi cnh i: di ti a 1.200mm

v rng ti a 300mm. Van gi nhiu cnh: - i vi cnh i c cc cnh ngt on ti thiu mi 6mm: di ti a 1.200mm v rng ti a 175mm.

Bearings Type: Oil impregnated sintered bronze bearings, sealed-for-life ball bearings or engineering plastic sleeve bearings. If the operating temperature is > 50C, do not provide nylon. Lubrication: Provide access for lubrication. Housings: Rivet to damper frames.

trc Loi: ng thic c du t bi trn, bi nim kn hoc bi lt plastic k thut. Nu nhit hot ng ln hn 50C, khng c s dng nylon. Bi trn: cung cp khng gian tip cn thc hin bi trn. Gi trc: bt rive vo khung ca van gi.

Spindles Material: Stainless steel in stainless steel dampers, zinc-plated steel or stainless steel otherwise. Construction: Securely fix to damper blades. Minimum diameter: - Blade lengths 600 mm: 10 mm. - Blade lengths > 600, 1200 mm:

12 mm.

Trc quay Vt liu: thp khng r cho van gi thp khng r, thp m km hoc nu khng th thp khng r. Cu to: bt cht vo cnh van. ng knh ti thiu: - Chiu di cnh 600 mm: 10 mm. - Chiu di cnh > 600, 1200 mm:

12 mm.

Linkages Fix securely to blades so that the blades rotate equally and close tightly without slip.

S lin kt Bt cht vo cnh cc cnh quay bng nhau v ng cht m khng b trt.

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Damper adjustment Provide for adjusting the damper and locking it in position. Locate in an accessible position. Label the open and closed positions clearly and permanently.

iu chnh van gi Thc hin iu chnh van gi v kho cht n vo ng v tr. t v tr c th tip cn c. Ghi nhn c nh cc v tr ng v m r rng.

4.3 SPLITTER DAMPERS 4.3 VAN GI KIU CHIA NHNH

Construction Fabricate to AS 4254 Figure 2.3 (H) with a minimum length 1.5 times the width of the larger branch. Limitation: Use only on supply ducts and only if duct velocity is less than 10 m/s. Provide volume control dampers otherwise. Push rods: 5 mm diameter with screw locking bushes to fix position. Number of push rods: - Splitter height < 600 mm: One push

rod. - Splitter height 600 mm: Push rods at

600 maximum spacing.

Cu to Ch to theo AS 4254 hnh 2.3 (H) c chiu di ti thiu bng 1,5 ln chiu rng ca ng nhnh rng hn. Gii hn: ch s dng trn ng gi cp v ch khi tc trong ng gi nh hn 10m/s. Nu khng th phi s dng van gi chnh lu lng. Thanh y: ng knh 5mm c vis kha ng lt vo v tr c nh. S lng thanh y: - Chiu cao ca van < 600 mm: 01

thanh y. - Chiu cao ca van 600 mm: lp t

cc thanh y cch nhau ti a 600mm.

4.4 MOTORISED DAMPERS 4.4 VAN GI IU KHIN MT

Construction Comply with Volume control dampers, and the following: - Side seals: Aluminium or stainless

steel. - Blade tip seals: Neoprene or silicone

rubber. - Leakage: 25 L/s.m2 at 1.5 kPa

pressure differential. - Bearings: Sealed-for-life ball bearings

only. - Drive shafts: Keyed, square or

hexagonal.

Cu to Tun th van gi chnh lu lng, v cc iu sau. - Nim cnh bn: nhm hoc thp

khng r - Nim nh cnh: neoprene hoc cao

su silicone - r : 25 L/s.m2 1.5 kPa chnh

lch p sut. - trc: ch s dng bi nim kn. - Trc dn ng: dng then, ch nht

hoc lc gic.

Installation Maintenance access: Locate dampers and damper motors in accessible positions, for blade and motor maintenance and blade seal replacement. Mounting: Sufficiently rigid to prevent flexing or distortion of the frame or ductwork during operation. Operation: If 2 sets of dampers are connected to a single motor, provide linkages which allow either damper to be adjusted without affecting the other.

Lp t Tip cn bo tr: t van gi v mt iu khin cc v tr c th tip cn c, bo tr mt v cc cnh v thay th cc nim cnh. Khung g: cng ngn nga cc un cong v vn vo ca khung hoc ng gi trong lc lm vic. Hot ng: nu 2 b van gi c ni vi cng mt mt. Lp t cc kt ni sao cho c th iu chnh van gi ny m khng lm nh hng n van gi kia.

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4.5 NON-RETURN DAMPERS 4.5 VAN GI MT CHIU

Construction Comply with Volume control dampers, counterweight the assembly so that it - offers minimum resistance to air flow;

and - closes by gravity.

Cu to Tun th van gi chnh lu lng, i trng cc cm chi tit sao cho: - C tr lc nh nht cho lu lng

khng kh v - ng li bng trng lc

4.6 FIRE AND SMOKE DAMPERS 4.6 VAN GI CHNG CHY V CHNG KHI

General Provide free cross section area at least 85% of the face area. Enlarge duct both sides of damper if necessary to achieve this. Material: To Fire damper schedule.

Tng qut S dng din tch mt ct ngang hiu dng ti thiu 85% ca din tch mt. lm rng ng gi ra c 2 bn van gi nu cn thit t c iu ny. Vt liu: theo bng lit k van gi ngn chy.

Links Fire dampers: Frangible bulb or fusible links. Smoke dampers: Fusible links activated by either local heat or a low power external electrical impulse. Installation: Mount for easy replacement.

Ni kt Van gi ngn chy: bu d v hoc kt ni cu ch. Van gi ngn khi: kt ni cu ch tc ng bng nhit ti ch hoc xung in thp t bn ngoi. Lp t: lp t sao cho d thay th.

Access panels Provide for maintenance of dampers and replacement of links.

Np thm Cung cp thc hin bo tr van gi v thay th ni kt.

4.7 SUBDUCTS 4.7 NG GO NHNH

General Standard: To AS/NZS 1668.1. Material: Same as connecting ductwork or shaft. Subducts through lightweight walls: If the duct is larger than 500 x 500 mm and longer than 3 m provide: - Breakaway joint at the subduct to

AS 1682.2. - Bracing struts or other support so the

load from the subduct does not cause excessive deformation of the wall.

Tng qut Tiu chun: theo AS/NZS 1668.1. Vt liu: tng t ng gi m ng nhnh ni vo hoc ng ng ng nhnh xuyn tng loi nh: nu n gi ln hn 500x500 v di hn 3m th cung cp: - Mi ni cch ly ti ng nhnh theo

AS 1682.2. - Thanh ging tr lc hoc gi

trnh lm bin dng qu mc tng do ti trng ng go

4.8 VARIABLE AIR VOLUME (VAV) BOXES

4.8 HP THAY I LU LNG GI (VAV)

Selection Maximum design air flow rate of each unit: 80% of the maximum rating shown in the manufacturer's catalogue. Site adjustment: Provide for site adjustment of the maximum capacity by 25% of the design value.

Chn thit b Lu lng thit k ti a ca mi hp: 80% lu lng a ra trong ti liu ca nh sn xut iu chnh ti cng trng: cng sut ti a bng 25% gi tr thit k

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Pressure independent boxes Provide pressure independent boxes unless otherwise indicated. Air volume range: Within 5% of design values with inlet duct pressure varying from 50 400 Pa.

Hp ngn p Cung cp hp ngn p tr khi ch nh loi khc Dy lu lng: Trong khong 5% gi tr thit k vi p ti ng gi vo dao ng t 50-400Pa

Casings Material: Metallic-coated steel, minimum 1 mm thick. Leakage: < 1% at maximum operating pressure. Fan assisted boxes: Provide access panels with quick release fastenings, to allow fan removal with the box connected to the ductwork. Duct connections: - Inlet: Round, oval or rectangular, to

suit application. - Outlet: Drive slip or flanged.

V bc Vt liu: thp m kim loi, du ti thiu 1mm R r:

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. Minimum noise reduction: 5 dB. . gim n ti thiu: 5dB.

5 ACCESS OPENINGS 5 L THM

5.1 LOCATION 5.1 V TR

Access doors Provide an access door in each section of air handling units where access is required for maintenance, inspection or removal of components. Removable panels may be used instead of doors where access is required only for removal of coils.

Ca thm Cung cp mt ca thm mi phn ca cc dn lnh ln ni no c yu cu bo tr, kim tra hoc tho ri cc chi tit. Np tho ri c th s dng thay th cho ca nhng ni ch cn tip cn thay th coil.

Access panels Provide access panels in the following locations: - Next to each component located inside

the duct requiring regular inspection and maintenance including, but not limited to: . Fire and smoke dampers. . Smoke detectors. . Motorised dampers. . Filters. . VAV boxes. . On the air entering side of electric

duct heaters. . On the air entering side of duct

mounted heating coils. - In air handling units where unit size is

insufficient to fit an access door. - Where specified in Kitchen exhaust. - In the vicinity of moisture producing

equipment, to AS 3666.1 clause 2.11.3.

- In other locations specified and/or shown on the drawings.

Np thm Cung cp np thm cc v tr sau: - Bn cnh cc cm chi tit nm bn

trong ng gi i hi kim tra v bo tr nh k, bao gm nhng khng b gii hn bi: . Van gi ngn chy v ngn khi. . u d khi. . Van gi iu khin mt. . Lc gi. . Hp VAV. . Pha ly gi vo ca in tr nung

nng ng gi. . Pha ly gi vo ca ng gi c lp

coil gia nhit. - Trong dn lnh c kch thc khng ln gn ca thm.

- Ni c ch nh trong ng ht nh bp.

- Gn thit b to m, theo AS 3666.1 iu 2.11.3.

- Trong cc v tr khc c ch nh v/ hoc c th hin trn bn v.

5.2 ACCESS PANELS 5.2 NP THM

Sizes Access panels: Minimum clear opening: - Personnel access: 450 x 600 mm. - Hand access: 200 x 300 mm.

Kch thc Np thm: l trng nh nht: - Cho ngi vo: 450 x 600 mm. - Cho tay vo: 200 x 300 mm.

Construction Type: Double panel, deep formed, zinc-coated steel construction, insulated to match the duct, or filled with at least 25 mm mineral wool insulation. Cold bridging: Arrange to prevent condensation on cold surfaces. Frames: Provide rigid matching galvanized steel frames securely attached to the duct. Do not protrude any part of the panel or frame into the airstream. Seals: Silicone rubber or soft neoprene gaskets mechanically fixed to either the panel or the frame to ensure an airtight

Cu to Loi: 2 lp, su, thp m km, cch nhit ph hp theo ng gi, hoc s dng ti thiu 25mm cch nhit len khong. Cu thu nhit: b tr ngn nga s ngng t trn cc b mt lnh. Khung: s dng khung thp trng km cng gn cht vo ng gi. Khng c t li bt k phn no ca np thm hoc khung vo trong lung khng kh. Nim kn: cao su silicone hoc m neoprene mm gn lp c kh vo np

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seal against the operating pressure when latched in the closed position. For fire rated seals, provide woven ceramic fibre material. Latches: Wedge type sash latches. Number of latches: - For personnel access: 4. - For hand access: 2. Handles: Provide a D handle on access panels for personnel access.

hoc khung m bo kn kh i vi p sut lm vic ti v tr ng. i vi cc nim kn chng chy, cung cp vt liu si gm. Cht: cht trt kiu ci nm. S lng cht: - i vi ngi vo: 4 - i vi tay vo: 2 Tay cm: cung cp tay ch D trn np thm cho cc l ngi vo.

5.3 ACCESS DOORS 5.3 CA THM

Construction General: Provide rigid, reinforced access doors. Minimum clear opening: 1.35 m high x 600 mm or larger to permit safe removal of equipment inside the section. Door swing: Against air pressure. Cold bridging: Arrange to prevent condensation on cold surfaces. Frames: Rigid matching galvanized steel frames securely mounted. Door hardware: Provide proprietary clamping-type latches and handles which can be operated from both the inside and the outside of the door. Seals: Silicone rubber or soft neoprene gaskets mechanically fixed to the door to ensure an airtight seal when latched closed. For fire rated seals, provide woven ceramic fibre material. Insulation: To match surrounding ductwork/plenum.

Cu to Tng qut: lp t ca thm gia c cng. L m ti thiu: cao 1,35m x rng 600mm hoc ln hn c th tho ri d dng cc thit b bn trong khu vc. Chiu quay ca: ngc vi p sut gi. :b tr ngn nga s ngng t trn cc b mt lnh. Khung: thp trng km cng gn cht. Phn kim loi ca ca: s dng cht kp v tay cm nguyn b ch to sn, c th hot ng t 2 pha trong v ngoi ca ca. Nim kn: cao su silicone hoc m neoprene mm gn lp c kh vo np hoc khung m bo kn kh khi cht ng li. i vi cc nim kn chng chy, cung cp vt liu si gm dt. Cch nhit: tng thch vi ng gi/ h thng thng gi xung quanh.

6 AIR GRILLES 6 MING GI

6.1 GENERAL 6.1 TNG QUT

Manufacture General: Provide proprietary grilles - free from distortion, bends, surface

defects, irregular joints, exposed fastenings and operation vibration;

- mounted with secure and concealed fixings; and

- with flanges lining corners neatly

mitred and buffed, with no joint gaps. Material: Steel or aluminium. Finish: Powdercoated. Colour finish to be nominated by the Architect or Interior Designer prior to ordering of grilles.

Sn xut Tng qut: cung cp cc ming gi nguyn b ch to sn: - Khng b vn vo, cong, khuyt tt

b mt, mi ni khng bnh thng, nhn thy cc ph kin kp cht v run khi hot ng.

- G lp bng cc chi tit kn v chc chn; v

- C mt bch lt dc theo ng gc, gn nh khng c ni

Vt liu: thp hoc nhm. Hon thin: sn tnh in. mu hon thin c ch nh bi Kin trc s hoc nh thit k ni tht trc khi t hng mua ming gi.

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Volume control dampers Where applicable & accessible provide volume dampers at the duct takeoff. Alternatively, provide opposed blade dampers (ODBs) adjustable through the grille faces. Paint dampers matt black if visible through grilles. Fixings: Provide concealed fixings which allow removal without damage to surrounds or grilles.

Van gi chnh lu lng ni c th s dng v c th tip cn c, cung cp van gi chnh lu lng, ni chia nhnh ng gi. Cch khc, cung cp van gi c cnh i iu chnh qua b mt ming gi. Sn van gi mu en m nu nhn thy qua ming gi. C nh: S dng cc chi tit c nh khut c th tho ra m khng lm h hng xung quanh ming gi.

Variable volume systems Provide grilles tested for variable volume applications.

H thng lu lng thay i Lp t cc ming gi c th nghim cho cc ng dng lu lng khc nhau.

Volume control dampers Provide dampers adjustable through the grille faces. Paint dampers matt black if visible through grilles.

Van iu khin lu lng Cung cp cc van gi c th iu chnh qua b mt ming gi. Sn van gi mu en m nu c th nhn thy qua ming gi.

6.2 AIR GRILLE TYPES 6.2 CC KIU MING GI

Slot diffusers Finished appearance: Continuous and unbroken irrespective of the purpose of the slot. Blank off slots not used for supply or return air. For long lengths, provide aligning devices where necessary. Air flow deflection: Provide an adjusting device which can be operated through the slot to allow 180 deflection of air pattern. Air volume control: By a damper located at the flexible duct connection to the main ductwork.

Ming gi kiu c rnh B mt hon thin: lin tc khng b ngt khng k mc ch ca rnh. Bt cc rnh khng s dng cho gi cp hay gi hi. i vi nhng chiu di qu di, cung cp cc dng c chnh ng trc ni cn thit. Hng gi: Cung cp mt dng c iu chnh c th c vn hnh qua cc rnh cho php lm thay i 1800 mu gi. iu khin lu lng gi: bng mt van gi t ch ni t ng gi chnh ra ng gi mm.

Louvre ceiling diffusers Type: Multi-bladed, removable core 4-way blow configuration, fitted with a blanking plate for 1-, 2-, or 3-way blow, as appropriate. Reducer necks: If the outlet neck is smaller than the outlet necessary to suit the louvre face size, provide a reducer neck. Dampers: For equalising air flow, provide volume dampers at the duct takeoffs or alternatively, provide an opposed blade damper to each diffuser. It must be possible to adjust the air flow to individual diffusers.

Ming gi khuych tn gn trn Loi: nhiu cnh, cu to thi ra 4 pha c li tho ri c, gm vi 1 tm trng cho loi 1-, 2-, hoc 3- ng thi, cho ph hp. C gim: nu c ra nh hn kch thc cn thit th gn c vo kch thc mt cc cnh khuych tn, phi s dng c gim. Van gi: cn bng lu lng khng kh, s dng van gi chnh lu lng im r nhnh hoc cch khc cung cp van gi cnh ngc ti mi ming gi. Phi c kh nng iu chnh lu lng khng kh i n mi mt ming gi.

Side wall registers General: Double deflection type with horizontal front louvre blades and vertical rear blades at 19 mm maximum centres, capable of field adjustment of air throw over the range 45o. Blades > 600 mm long: Support at mid point on a notched support bar. Dampers: Provide volume dampers at the duct takeoffs or alternatively, provide

Ming gi gn tng Tng qut: kiu vng i vi cc cnh khuych tn trc ngang v l khuych tn sau ng khong cch tm ti a 19mm, c kh nng iu chnh phm vi gi trong khong 45o. Cnh di hn 600mm. c nng gia bng thanh c kha V. Van gi: cung cp van gi im r nhnh hoc cch khc, s dng kiu

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an opposed blade or scoop type damper to each.

cnh ngc hoc kiu xng.

Jet diffusers Provide 3 concentric sections made of spun aluminium, bolted together to give adjustable air deflection.

Ming gi trn S dng 3 phn ng tm lm bng nhm c, bt bulon vi nhau chnh c hng gi.

Return or exhaust grilles - indoor Full chevron type: 50% minimum free area. Louvre type: Single angled louvres at 19 mm maximum centres. To be the fixed bar, single deflection type with horizontal bars matching supply register and opposed blade damper. Egg crate type: For horizontal applications unless otherwise specified. Elements at 90o to each other, and at 15 mm maximum centres.

Ming gi hi hoc ht trong nh Kiu ch V hon ton: ti thiu 50% din tch trng. Kiu cnh khuych tn: cnh khuych tn gc n khong cch tm ti a 19mm. Kiu thanh gn c nh, kiu vng n vi thanh ngang tng thch vi ming gi cp v van gi cnh ngc. Kiu t ong: dng cho cc ng dng ngang tr khi c ch nh khc i. Cc chi tit vung gc nhau v c khong cch tm 15mm.

6.3 SOUND POWER LEVELS 6.3 N At the scheduled flows, air terminals shall not exceed the following sound power levels (Note, as a rule of thumb and in absence of more detailed information, subtract 12 dBA to arrive at anticipated sound pressure levels).

Trong bng lit k lu lng, cc thit b gi u cui khng c vt qu n m thanh nh sau (lu , ly tng ng v trong trng hp thiu cc thng tin chi tit, tr i 12dBA c mc p sut m thanh mong i)

Sound power levels in dB re 10 -12 watts

Mc m thanh dB re 10 -12 watts Frequency (Hz) Tn s

250 500 1k 2k 4k

Offices / Open areas Vn phng/ Khu vc ngoi tri

50 45 41 39 36

Seminar, conference rooms Phng hi tho, hp

46 42 38 36 34

6.4 INSTALLATION OF AIR GRILLES

6.4 LP T MING GI

Protection Leave protective wrappings, in place until final mounting.

Bo v Gi nguyn cc bao b, bng bo v cho n khi lp t cui cng.

Mounting General: In tiled ceilings, locate to minimise cut tiles. Otherwise, locate grille symmetrically in the tile. Provide a matching escutcheon to close gaps between the grille and its surrounds. Provide grilles with flanges to cover penetrations and irregularities in surrounds. Appearance: Install square.

Lp t Tng qut: trn trn ni chia , t ch sao cho gim thiu khng phi ct trn. Nu khng th, t ming gi i xng cc . Cung cp mt khung bao che che cc khe h gia ming gi v xung quanh. S dng ming gi c mt bch che cc l h v tnh khng u ca xung quanh. B ngoi: lp cho vung gc.

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Fixing Visibility: Provide concealed fixings. Accessibility: Provide fixings which allow removal without damage to surrounds or outlets. Gaskets: Provide foam type gaskets under outlet flanges or flanged supports.

Ph kin kp cht Kh nng nhn thy: s dng cc ph kin khut, khng nhn thy. Kh nng tip cn c: s dng cc ph kin c th tho ri m khng lm h hng n xung quanh hoc ming gi. m: s dng m kiu bt ni pha di mt bch ming gi hoc cc chn c mt bch.

Plenum boxes General: Provide side entry plenum boxes to diffusers connected to flexible ductwork. Support of plenum boxes: - Louvre ceiling: Independently from

above. Flexible duct connections: Provide round or oval spigots on plenum boxes. Internal insulation: - Insulation type: Semi-rigid mineral

wool, 25 mm minimum thickness. - Surface facing type: Factory applied

perforated aluminium foil laminate. - Required for supply & return ducts

and exhaust ducts where meeting noise levels require it.

Painting: Paint interior of plenum box matt black if visible through grilles.

Hp gi Tng qut: s dng hp gi ly gi vo t mt bn cho cc ming gi ni vi h thng ng gi mm. Treo cho hp gi: - i vi ming gi gn trn: c lp

vi pha trn. u ni ng gi mm: s dng u ni trn hay van trn hp gi. Cch nhit bn trong: - Loi cch nhit: len khong na

cng, dy thiu 25mm. - Kiu ph mt ngoi: bng keo nhm

mng c l lm ti nh my. - Yu cu cho ng gi cp v ng gi

hi v ng gi thi ni n yu cu i hi phi c.

Sn: sn bn trong hp gi mu en m nu c th nhn thy qua cc khung ming gi.

7 SOUND ATTENUATION 7 GIM M

7.1 ACOUSTICAL LINING 7.1 LT CCH M

Design Considerations To be provided in the discharge duct of each air handling unit for a minimum distance of at least 6 m from the fan. Each return and exhaust duct for a distance of 6 m from the intake plenum. In the discharge of each ceiling mounted fan coil unit or VAV. Acoustic lining shall be installed in ductwork, which services more than one enclosed space to the extent required to prevent acoustic transfer from one space to the other.

L do thit k c lp t u ra ca mi dn lnh n khong cch ti thiu l 6m t qut. Mi ng gi hi v ng gi thi n khong cch 6m t hp gi vo. u ra ca mi dn lnh nh gn trn hoc hp VAV. Lt cch m phi c lp t trong ng gi, phc v cho hn 1 phng v ko di n phng khc yu cu ngn nga s lan truyn m thanh t khng gian ny sang khng gian khc.

Duct Dimensions Dimensions of lined ducts shown on drawings are airway dimensions after lining has been installed.

Kch thc ng gi Kch thc ca ng gi cch m th hin trn bn v l kch thc ca ng gi sau khi ng lt c lp t vo.

Duct Attenuator Construction Type: Rectangular or circular, with or without internal pod. Material: Galvanized sheet steel case, with heavy density acoustic infill, covered by perforated metal. Provide

Cu to ng gim m Loi: hnh ch nht hoc trn, c hoc khng c li trong. Vt liu: v thp trng km, c vt liu cch m t trng cao bn trong, c che bng tm kim loi c l. S dng

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factory applied tissue facing to acoustic fill. Provide welded end flanges. Clean welds and prime. Waterproofing: Wrap insulation with polyester film. Seal edges with aluminium foil laminate tape.

vi mng gn ti nh my che mt ngoi ca lp vt liu cch m. V sinh sch cc mi hn v sn lt. Chng nc: Bao che cch nhit bng lp mng polyester. Lm kn cnh ra bng bng keo nhm.

7.2 ACOUSTIC LOUVRES 7.2 MING GI GIM M

Construction General: Folded sheet with acoustic perforated blades filled with inert non-combustible acoustic material. Provide factory applied tissue facing to acoustic fill. Provide stainless steel fixings for external applications. Waterproofing: Wrap insulation with polyester film. Seal edges with aluminium foil laminate tape. Materials: - Steel: 1.6 mm zinc-coated sheet steel,

powdercoated. - Aluminium: 2 mm grade 5005

aluminium sheet, powdercoated.

Cu to Tng qut: thp tm gp m c cnh c l cha vt liu cch m tr khng chy. S dng vi mng gn ti nh my che mt ngoi ca lp vt liu cch m. S dng ph kin thp khng r cho cc ming gi lp t ngoi tri. Chng nc: Bao che cch nhit bng lp mng polyester. Lm kn cnh ra bng bng keo nhm. Vt liu: - Thp: thp tm m km dy 1.6mm

sn tnh in. - Nhm: nhm tm dy 2mm mc

5005, sn tnh in. Bird guards Provide removable corrosion resistant wire mesh guards for external applications.

Li ngn chim Cung cp li che ngn chim chng n mn cho cc trng hp lp bn ngoi.

8 COMPLETION 8 HON TT

8.1 GENERAL 8.1 TNG QUT

Balancing test points Provide a sufficient number of sets of suitably sized holes in ductwork for testing and balancing of the system. Seal with rubber grommets in low pressure ductwork. Seal with cover plates in medium and high pressure ductwork.

Cn bng cc im th nghim Cung cp s lng b cc l c kch thc ph hp trn h thng ng gi th tra v cn bng h thng. Nim kn bng cc vng m cao su trn phn ng gi p sut thp. Nim kn bng tm y phn ng gi p sut trung bnh v cao.

Balancing devices After balancing the system, lock balancing devices and permanently mark the balanced positions.

Thit b cn bng Sau khi cn bng h thng, kha cng thit b cn bng v nh du v tr cn bng.

8.2 COMPLETION TESTS 8.2 KIM NGHIM HON TT

Fire and smoke dampers Site testing: Test fire dampers during commissioning and maintenance to ensure they close fully with fans operating.

Van gi ngn chy v ngn khi Th nghim ti cng trng: Th nghim van gi ngn chy trong qu trnh chy th v nghim thu v bo tr m bo chng ng hon ton cng vi hot ng ca qut.

B.27 Ductwork - VN - Centrepoint

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