3.20.8 GENERAL SPD EXHAUST SYSTEM
Provide a dedicated general exhaust system for the entire SPD suite,
including steam sterilizers. Note the following guidelines:
3.20.8.1 An air-to-air or glycol run around heat recovery system can be
installed in the exhaust system.
3.20.8.2. Provide appropriate air balance to maintain:
(a) Positive pressure in clean and preparation area
(b) Negative pressure in soiled and dirty area
(c) Negative pressure in entire SPD area
(d) Limiting maximum air temperature in the mechanical chase housing the
steam sterilizers
3.21 SURGERY SUITE SYSTEMS
3.21.1 GENERAL
Each 0perating Room (O.R.) in the surgery suite shall have an individual
temperature and humidity control. Cystoscopy Room shall be treated as an
Operating Room if the room is a part of the surgery suite. For location
other than surgery suite, such as, the Spinal Cord Injury Unit, the
Cystoscopy Room shall be treated as a special procedure room only.
3.21.2 INDOOR DESIGN CONDITIONS
Summer and Winter: Adjustable 17-27 degrees C (62-80 degrees F) and 45-55
degrees RH.
3.21.3 SUPPLY AIR
Maintain minimum of 15 air changes per hour, when the operating room is
occupied and 8 air changes per hour when the room is unoccupied, with at
least 100 percent outdoor air.
3.21.4 EMERGENCY POWER REQUIREMENTS
All supply and exhaust fans, dedicated chillers and pumps and controls
servicing surgical suites shall be on emergency power.
3.21.5 SYSTEM DESCRIPTION
Provide dedicated supply and exhaust air systems for the Surgery Suite. .
The supply air system shall be single duct, low velocity type with unlined
constant volume reheat terminal units. The supply air terminal units
serving O.R. shall have two-position settings (occupied and unoccupied)
manually controlled by a switch located in each O.R. and/or at the
associated nursing unit. The exhaust duct shall also be equipped with
corresponding two-position, tracking air flow control valves to maintain
pressure relationship during occupied and unoccupied modes.
3.21.6 AIR HANDLING UNITS (AHUs)
The AHUs serving Surgery Suite shall have pre-filters, after-filters
(except orthopedic surgery units, which shall also have a terminal HEPA
filter), energy recovery coil, cooling coil, central humidifier (to raise
humidity level up to 30 percent RH), and a variable speed fan for the air
volume control. The after-filters shall be located on the discharge side
of the fan with a diffuser section in between, to ensure uniform
HVAC DESIGN MANUAL
3-23
HVAC REQUIREMENTS FOR OCCUPIED AREAS
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