B YC H R I S P . R O U S S E A U , P E , L E E D A P B D + C

Updates to ANSI/ASHRAE/ASHE Standard 170-2008,

Ventilation of Health Care Facilities

27th Annual AHCA/FHEA SeminarOrlando, Florida

September 26, 2011

History of Standard

a. Roots in ASHRAE Standard 62 and AIA Guidelinesb. First ASHRAE Standard to be co-sponsored with ASHEc. First Standard Project Committee Meeting – 2002d. Standard Issued – 2008e. Standing Committee Status – 2009f. Included as Part 6 in FGI Guidelines - 2010

Addenda – Overall Status

7 Addenda Approved 1 Addendum Rescinded 1 Addendum on Hold 3 Addenda Reviewing Public Comments 2 Addenda Pending ASHRAE Approval for Public

Review 6 Addenda in Committee

Addendum a

Status – Approved Topic – Miscellaneous Revisions/Clarifications

Revised newborn intensive care temperature Clarified “corridor” requirements Clarified RH range requirements – “min/max allowable at any

point within the design temperature range required for that space”

Addendum a Table

©2011 American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc. (www. ashrae.org) Reprinted by permission from 2011 ASHRAEStandard 70-2008. This material may not be copied or distributed in either paperor digital form without ASHRAE’s permission.

Addendum b

Status - Approved Topic – Miscellaneous Revisions/Clarifications

Changed MERV 17 to HEPA Exempted relief air from outside air intake limitations Required individual temperature control for operating rooms Added differential pressure requirement for morgue and autopsy Table 7-1 changes:

-added intermediate care, revised triage, radiology waiting-added “design” to RH column header-allowed recirculated room HVAC units in laboratories-revised pressure relationship requirements for critical and intensive care and burn units-corrected endoscopy air change rate

Addendum b Table

Addendum c

Status - Rescinded Topic - Recirculating Room HVAC Units

Addendum d

Status - Approved Topic - Critical Area Humidity Requirements

Reduced minimum relative space humidity from 30% RH to 20% RH in these short stay spaces:

Class B and C Operating RoomsOperating/Surgical Cystoscopic RoomsDelivery RoomsTreatment RoomsTrauma RoomsLaser Eye RoomsClass A Operating/Procedure RoomsGastrointestinal Endoscopy Procedure Rooms

Addendum e

Status - Approved Topic - Exhaust Ductwork Clarification

Exhaust ductwork negative anywhere in the building Interior exhaust ductwork on discharge side of fan - Seal Class A

Addendum f

Status - Approved Topic - AII Anterooms/Combination AII/PE Rooms

AII rooms may be used for non-infectious patients No specific pressure differential required between AII Room and

associated toilet room Differential pressure monitoring of AII and PE rooms required Anteroom requirements (if provided) Combination AII/PE Rooms

Addendum f Table

Addendum g

Status - Approved Topic - Displacement Ventilation

Allows Group D diffusers for single bed patient rooms Includes minimum requirements for design of displacement

ventilation systems

Addendum g Table

Addendum h

Status - Approved Topic - Recirculating Room HVAC Units

All ventilation air must be filtered per Table 6-1 Rules for recirculating room HVAC units

- all outside air supplied to units must be filtered and conditioned- may only serve a single space- MERV6 filter required if any surface designed to condense

moisture Recirculated airflow counts towards Total Air Change Rates

required by Table 7-1

Addendum i

Status - On Hold Topic - Alternate Compliance Method

Addendum j

Status - Reviewing Public Comments Topic - Nursing Home Requirements

Restored requirement for second filter bank (MERV 13) in skilled nursing, sub-acute care, and dementia facilities

Restored filtration requirements for hospice and assisted living facilities (MERV 7)

Added ventilation requirements for resident corridors and personal services spaces

Addendum k

Status - In Committee Topic - Energy Recovery

Looking at 3 types of systems:- No potential for cross-contamination (run around coils) (0%)- Some potential for cross-contamination (heat pipes, air to air

heat exchangers) (<2%)- More potential for cross-contamination (rotating wheels) (<5%)

AII Rooms – 0% Areas with potential airborne contaminates (ER waiting, autopsy,

lab, bronchoscopy, etc.) - <2% Other spaces - <5%

Addendum l

Status - Reviewing Public Comments Topic - Caesarean Delivery Rooms/New Spaces

Operating/surgical cytoscopic rooms and caesarean delivery rooms have same air distribution requirements as Class B and C operating rooms

New spaces added to Table 7-1

Addendum l Table

Addendum m

Status - Reviewing Public Comments Topic – Ducted Return Air Systems

In addition to spaces listed in Table 7-1 that have differential pressure requirements, these spaces also must be served by ducted return air systems:

- Recovery Rooms- Critical and Intensive Care- Intermediate Care- Burn Unit

Addendum n

Status - Pending ASHRAE Approval for Public Review

Topic - Ventilation Air Quantity Calculations Minimum ventilation rate – sum of room totals based on Table 7-1 Alternate approach – Ventilation Rate Procedure (multiple space

formula) in Standard 62

Addendum o

Status - In Committee Topic - Office Surgeries

Addendum p

Status - Pending ASHRAE Approval for Public Review

Topic - Nourishment Stations Added ventilation requirements for nourishment stations in Table

7-1

Addendum p Table

Addendum q

Status - In Committee Topic - Pharmacy Pressure Relationships

Clarifies potential negative pressure requirements for areas compounding hazardous chemicals (USP 797)

Addendum r

Status - In Committee Topic - Coordination with FGI

Add definitions of “Absorption Distance” and “Essential Accessories”

Delete second filter bank for psychiatric facilities Require coordination between air handling unit zones and smoke

zones to minimize smoke dampers Allow high returns in operating rooms, in addition to low returns Require - 0.01” differential pressure for bronchoscopy Require continuous operation of operating and caesarean delivery

room ventilation systems

Addendum s

Status - In Committee Topic - Humidifier Types

Steam humidifiers only

Addendum t

Status - In Committee Topic- Additional FGI Coordination

Definition of volume of ER and Radiology waiting areas Duct lining requirements Anesthesia scavenging Unoccupied mode of operation for operating rooms and AII rooms

Republication

Anticipated 2013 Part of 2014 Guidelines

Future Issues

Return Air Plenums in Outpatient Occupancies Rooftop Air Handling Unit Gas Vents Chilled Beam Systems Individual Room Temperature Control ER Exam Room Ventilation Requirements

Questions?

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Chris P. Rousseau, PE, LEED AP BD+CPartner

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27th Annual AHCA/FHEA SeminarOrlando, Florida

September 26, 2011