June 99
A.
FLAMMABLE STORAGE: Exhaust with an explosion-
proof fan and provide sprinklers. Heat is not required.
B.
PESTICIDE STORAGE: Exhaust with an explosion-
proof fan and provide sprinklers. Provide heat.
3.3
VEHICLE MAINTENANCE:
A.
GENERAL: Provide a dedicated heating and
ventilating unit for the maintenance section of the
vehicle facility to supply at least 8 air changes per
hour. Also provide a corresponding exhaust system
for exhausting all air to the outdoors.
B.
SYSTEM FEATURES:
1.
The supply air system shall comprise of a fan,
filter (30% ASHRAE Test Efficiency), and heating
coil sections. Investigate the use of gas or oil
fired heating sections. Ensure uniform distribution
of air by ductwork and supply outlets.
2.
The heating shall be thermostatically controlled.
The set back temperature during night and
holidays shall be maintained by a set of unit
heaters or by cycling the supply air system
without any outside and the outside air dampers
closed. During this mode of operation the normal
interlock with the exhaust air system shall be
overridden.
3.
The exhaust air shall be picked up at floor level
(150 mm (6") above the floor) uniformly from each
service bay.
3.4
SMOKE AND FIRE CONTROL: Design the smoke control
for the HVAC systems in accordance with NFPA 90A to
affect system shutdown in the event of smoke detection.
Install a duct mounted smoke detector in the main supply
air duct, on the downstream side of the after filters and
prior to any duct take-off, of all supply air systems of
capacities greater than 56 m3/min. (2000 CFM). Upon
smoke detection, the duct detector (through its auxiliary
contacts) shall:
a.
Stop the supply and associated return air fan: the
building exhaust air fans shall continue to run.
b.
Sound an alarm at the fire alarm system.
VA Design Guide -- National Cemetery Administration
Page 5 -61
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