4 HVAC REQUIREMENTS FOR UNOCCUPIED AREAS
4.1 BATTERY CHARGING AREAS
4.1.1 GENERAL
The exhaust ventilation system for the battery charging areas depends
upon the type of batteries used.
4.1.2 AUTOMATIC TRANSPORT SYSTEMS (ATS)
The lead-acid batteries, used for the ATS, require a dedicated exhaust
system to remove fumes from the area and prevent build-up of explosive
mixtures from the batteries.
4.1.2 EXHAUST AIR REQUIREMENTS
(a) Maintain a minimum of 8 air changes per hour and negative pressure
in the battery charging air.
(b) The exhaust system shall be corrosion-resistant stainless steel
ductwork, spark-proof construction fan, and explosion proof motor.
(c) The wall or ceiling mounted exhaust registers shall be located over
the batteries to capture the fumes directly.
(d) Exhaust fan shall be on emergency power.
(e) Air flow switch shall be provided to detect interruption in airflow
with audible and visible alarms, local as well as at the Engineering
Control Center.
4.1.3 EMERGENCY GENERATOR/SWITCHGEAR ROOM BATTERIES
The batteries used in these areas are Ni-Cad type, which do not
generate fumes. There are no special exhaust requirements for these
batteries. See paragraphs 2.10.6 and 2.10.7 for ventilation
requirements of the emergency generator room and switchgear rooms.
4.1.4 WHEEL CHAIR BATTERY CHARGING AREA
Provide ventilation system in accordance with paragraph 4.1.2 if the
area has capacity to charge 5 wheel chairs concurrently.
4.2 BIOMEDICAL INSTRUMENT REPAIR SHOP
4.2.1 GENERAL
Provide air conditioning for the space from a central air conditioning
unit serving adjoining engineering shops.
4.2.2 EXHAUST AIR REQUIREMENTS
Provide a dedicated exhaust system. The canopy type stainless steel
exhaust hood (Type A, B, or C) located in the repair section of the
shop shall exhaust room air at the rate of 0.51 m/s (100 fpm) over the
hood area. Coordinate hood location and size with the architectural
equipment drawings. Since the repair work involves use of mercury,
xylene, and other toxic chemicals, the exhaust system shall be of
corrosion resistant ductwork, spark-proof fan, and explosion proof
motor. Provide an alternate return air duct with motorized dampers to
HVAC DESIGN MANUAL
4-1
HVAC REQUIREMENTS FOR UNOCCUPIED AREAS
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