(b) Assume 745 W (1.0 HP) fan motor internal heat gain per each dental
technician bench. Each bench is to be equipped with a built-in dust
collector through which the room air is to be recirculated.
(c) Provide a general exhaust system through Type A canopy hoods, sized at
0.5 m/s (100 fpm) face velocity over the boil-out sink and casing-
soldering areas. A portion of the exhaust duct between the boil-out sink
and general exhaust ductwork shall be constructed of stainless steel or
non-corrosive material. If the room air is short of the exhaust
requirements, increase the air handling unit capacity accordingly, to
provide additional air quantity. Draw approximately 15 percent of the
total exhaust air from the adjoining corridor.
3.10 INTENSIVE CARE UNITS (ICUs)- Medical, Surgical and Coronary
3.10.1 INDOOR DESIGN CONDITIONS
Summer: 22 degrees C (72 degrees F) Db, 50 percent RH
Winter: 25 degrees C (78 degrees F) Db, 30 percent RH
3.10.2 SUPPLY AIR
Maintain minimum 8 air changes per hour.
3.10.3 PRESSURE RELATIONSHIP
Maintain positive pressure in the room.
3.10.4 EMERGENCY POWER REQUIREMENTS
HVAC equipment serving ICU's shall be on emergency power.
3.10.5 SPECIAL REQUIREMENTS
(a) Provide a dedicated air-handling unit for ICU ward of larger than 5
beds. Where there are approximately five (5) ICU beds or less, a dedicated
unit may be omitted, and these rooms may be served from another building
HVAC system provided the system meets filtration requirements for ICUs and
all supplied air is exhausted to outdoors. In existing buildings where
it's not practical to exhaust 100 percent from the ICUs, air shall be re-
circulated through HEPA filters with a caution that HEPA filters should be
installed at the air-handling units only. HEPA filters installed in branch
return air duct will create air balance problem.
(b) If ICUs are equipped with individual toilets for each bed, each toilet
shall be exhausted at the rate of 2.2 Cu M/Min (80 CFM).
(c) Provide individual temperature room controls for ICU Bed Rooms.
(d) Provide a special dedicated exhaust system for the Isolation Room in
accordance with the VA Standard Detail 15900-7 and Article 2.11, "Exhaust
Systems."
(e) Provide a status alarm for the HVAC fans at the nursing station when
the Engineering Control Center (ECC) is not available.
3.11 ISOLATION ROOMS
(a) Separate negative and positive pressure rooms are required. See
Article 2.11.6.
(b) See Table 3-5 and Table 3-6 for TB isolation rooms.
HVAC DESIGN MANUAL
3-7
HVAC REQUIREMENTS FOR OCCUPIED AREAS
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