25 October 2004
Q A = 32
x 3 x 2 = 192
ft3 60 min
ACH = 192
Ductwork. Design ductwork in accordance with paragraph 2-4.1. Use
FRP or PVC ductwork.
Fans and Motors. Select fans in accordance with paragraph 2-4.2. Use
AMCA 201, Type B spark resistant construction and explosion proof motors. Fans must
have non-sparking wheel. Locate the motor outside of the air stream.
Weather Stack Design and Location. Avoid re-entry of exhaust air by
intakes, or other such openings are located near the exhaust discharge. See paragraph
2-4.3 for additional considerations.
Air Cleaning Device
to the quantities and types
generated by this process, there is no requirement for air pollution control equipment.
Replacement Air. Design a replacement air system in accordance with
paragraph 2-4.5. Design the replacement air volumetric flow rate for approximately 95
percent of the exhaust airflow rate to provide a negative pressure inside the
maintenance facility. Use 100 percent outside air. Do not re-circulate exhaust air back
to the maintenance facility.
System Controls. Design system control in accordance with paragraph
2-5 and the following criteria:
a. Interlock the charging circuit and the exhaust fan in the shop to
ensure chargers will not operate without ventilation.
b. Provide indicator light showing that the exhaust system is functioning
SAFETY AND HEALTH CONSIDERATIONS. In accordance with 29 CFR
1926.403, Battery Rooms and Battery Charging, provide the following.
a. Face shields, aprons, and rubber gloves for workmen handling acids
b. Facilities for quick drenching of the eyes and body, within 7.6 m (25 ft)
of the work area for emergency use. See UFC 3-420-01 for eyewash