UFC 3-410-01FA
15 May 2003
4-8
EQUIPMENT ROOMS. Equipment rooms shall be provided with door(s) on
the building exterior that are sized to accommodate all maintenance and equipment
replacement anticipated throughout the life of the building. Where a refrigerating
system is housed within the equipment room, the design of the room shall comply with
ASHRAE 15. Otherwise, the design of the equipment room shall comply with the
following:
4-8.1
Mechanical Ventilation. Equipment rooms will usually be ventilated using
outside air intake louvers and a thermostatically controlled exhaust fan. Use a supply
fan in lieu of an exhaust fan in rooms where atmospheric burners are located. The
ventilation fan will have a two-speed motor, which is sized, at the high speed, to have
adequate capacity to limit the room dry bulb temperature to a maximum of 10 degrees F
(6 degrees C) above the outdoor dry bulb temperature when both equipment and
ambient loads are at their maximum peaks. The high speed will be activated 10
degrees F (6 degrees C) below the maximum temperature at which the most sensitive
item of equipment in the room can operate. The low speed will operate at 20 degrees F
(11 degrees C) below that of the high speed.
4-8.2
Air Conditioning. Air conditioning may be provided where life cycle cost
effective to prevent severe corrosion in salt-laden areas where, during the six warmest
consecutive months, the wet bulb temperature is 73 degrees F (23 degrees C) or higher
for over 4,000 hours.
4-9
BATTERY ROOMS. Provide battery rooms with an exhaust fan interlocked
with the battery charger so that the charger will not operate without ventilation. Size the
exhaust fan to prevent hydrogen concentration in the room from exceeding 2 percent by
volume. The power ventilation system for the battery room must be separate from
ventilation for other spaces. Air recirculation in the battery room is prohibited. The fan
motors must be outside the duct and battery room. Each blower will have a
nonsparking fan. Consider using a multiple speed fan or multiple fans when the room is
designed for two or more battery chargers. Size the exhaust fan as follows:
Q = 0.053 x I x N
Where:
Q = Required ventilation rate in ft3/min.
(Q = 0.025 x I x N
Where: Q equals the required ventilation rate in l/sec.)
I = 0.21 x (capacity of the largest battery to be charged in ampere-hours) or 0.25 x (the
maximum obtainable amperes from the charger), whichever is greater.
N = (number of batteries to be recharged at one time) x (number of cells per battery). A
single cell is normally 2 volts DC. Therefore, a 6-volt battery normally has 3 cells and a
12-volt battery normally has 6 cells. Areas used for battery storage in maintenance
14
Previous Page
