equipment. With the canopy type hoods, the exhaust air quantity shall be
based at the rate of 1.4 to 2.8 Cu M/Min (50 to 100 CFM) per square foot
of the hood area. The environmental air from the kitchen and other
occupied places shall be used as make-up air for the exhaust. The exhaust
air ductwork shall be constructed of stainless steel.
3.12.8 EXHAUST SYSTEMS - WET EXHAUST
The moist air over pot/pan and dishwasher should be captured by using
either canopy (Types A, B, C) hoods or any other similar hoods furnished
by the dishwashing equipment manufacturers. See VA Standard Detail 15840-
22. The exhaust air quantity shall be based at the rate of 1.4 to 2.8 Cu
M/Min (50 to 100 CFM) per square foot of the hood area. The environmental
air from the kitchen and other occupied areas shall be used as make-up air
for the exhaust. The exhaust air ductwork shall be constructed of
stainless steel.
3.12.9 HOT AIR DISCHARGE
Hot air discharge from baking and cooking ovens shall not be connected
directly to ductwork. Provide canopy exhaust hoods or grilles over hot air
discharge.
3.12.10 EXHAUST SYSTEMS - GENERAL EXHAUST
Depending upon the remaining available environmental air for exhaust,
general exhaust arrangement shall be provided through ductwork and ceiling
mounted registers/grilles over the heat producing equipment, such as
refrigeration compressors, plate warmer, mixers, etc. The exhaust air duct
can be connected to the wet exhaust duct system. The actual system
configuration and the system air balance will depend upon the specific
project parameters and may vary from project to project.
3.12.11 NIGHT SHUT DOWN
Since most or all of the heat producing equipment will be inoperative at
night, the quantity of supply and exhaust air shall either be reduced or
stopped. However, a neutral air pressure shall be maintained in the area.
Supply air need not be cooled at night.
3.13 LABORATORIES
3.13.1 INDOOR DESIGN CONDITIONS
Summer: 24 degrees C (76 degrees F) Db, 50 percent RH
Winter: 22 degrees C (72 degrees F) Db, 30 percent RH
3.13.2 SUPPLY AIR
Maintain minimum 12 air changes per hour.
3.13.3 AIR PRESSURE RELATIONSHIP
Maintain negative pressure in Laboratories.
3.13.4 EMERGENCY POWER REQUIREMENTS
All laboratory hoods exhaust fans for H3, H7 and H12 (B1 and B2 only), H13
and H14 hoods shall be on emergency power.
3.13.5 ORTHOTIC LABORATORIES
3.13.5.1 GENERAL: Coordinate ventilation requirements with the equipment
layout shown on the architectural drawings.
HVAC DESIGN MANUAL
3-10
HVAC REQUIREMENTS FOR OCCUPIED AREAS
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