Heating, Ventilation and Air

Conditioning Overview –

ASHRAE 170

Goals

Understand purpose of ASHRAE 170 guidelines

Knowledge of requirements for most common healthcare spaces/systems

Know where to look for further information.

Wisconsin AdoptionSPS 364.0202 Definitions. (d) “Health care facility” means a hospital, nursing home, outpatient surgical facility, or community−based residential facility.

SPS 364.0300 Health care facilities.

(1) This is a department rule in addition to the requirements in IMC chapter 3: In addition to the requirements in chs. SPS 361 to 366, the heating and ventilation systems for health care facilities only shall conform to the applicable provisions of FGI Guidelines for Design and Construction of Hospitals and Outpatient Facilities 2014, except as provided in sub. (2).

(2) (a) The requirements in parts 1 and 5 of FGI guidelines are not included as part of this chapter. (b) This is a department rule in addition to the requirements in part 6 of the FGI guidelines: Addenda a, b, d, e and f for ASHRAE 170 are included as part of this chapter, except as provided in sub. 2.

ASHRAE 170 -

Ventilation of

Healthcare FacilitiesThe purpose of this standard is to define

ventilation system design requirements that

provide environmental control for comfort,

asepsis, and odor in healthcare facilities.

6.1.1 Ventilation Upon Loss

of Electrical Power

AII rooms

PE rooms

Operating rooms (including C-section)

6.1.2 Heating and Cooling

Sources

N+1 redundancy for domestic hot water and building heat

Systems >400 tons to have N+1 redundancy to support “owner’s facility

operation plan”

6.3.1 Outdoor Air Intakes

25’ from exhaust, vent, cooling towers

6’ above grade, 3’ above roof

6.3.2 Exhaust

AII, bronchoscopy, ED waiting, nuclear medicine lab,

radiology waiting rooms, and chemical fume hoods:

Interior ductwork under negative pressure

10’ vertical discharge

Minimize recirculation into building

6.4 Filtration

6.7.2 Air Distribution

Devices

6.8 Energy Recovery

Upstream of Filter Bank No. 2

No AII rooms (except run-around coils)

5% leakage limit for energy wheels

Exhaust streams that may not be used ER waiting, triage, etc. (6.8.3)

7 Space Ventilation

7 Space Ventilation

7 Space Ventilation

7 Space Ventilation

7 Space Ventilation

7.1 General Requirements

Minimum air changes can be either supplied for positive pressure rooms or

exhausted for negative pressure rooms

Minimum outdoor air is the sum of individual space requirements

7.2.1 Airborne Infection

Isolation (AII) Rooms

-0.01” w.c. relative to surrounding spaces

Continuous pressure monitoring

Exhaust near patient head

Can only mix exhaust air with AII toilet room and ante room

No non-AII rooms

7.2.2 Protective

Environment (PE) Rooms

+0.01” w.c. relative to surrounding spaces

Continuous pressure monitoring

Supply near patient bed

Return/exhaust near door

7.2.3 Combination AII/PE

rooms

Supply near patient bed

Exhaust near door

Ante room that is either positive to all surrounding areas or negative to all

surrounding areas

7.4.1 Operating Rooms

+0.01” w.c. relative to surrounding spaces

Primary supply diffuser array above surgical table

(70% of area extending 12” around surgical table

must be diffusers)

Two low return/exhaust in opposite corners

7.4.3 Imaging Procedure

Rooms

Invasive procedures require room to meet requirements of:

Procedure rooms (minimum)

Operating rooms (if anesthetic gases are administered)

Any Questions?