25 October 2004
Figure 3-5. Exhaust and vacuum system schematic diagram
Install a prefilter and a HEPA filter in front of the blower to prevent it from
Design the vacuum system duct to balance with the exhaust system duct
where the two systems connect.
Use manufacturer guidance to design vacuum system and TM 5-805-4 as
Replacement Air. Design replacement air systems with fan inlet guide
vanes, variable speed motors, or "eddy current clutch" units to maintain a pressure
(relative to the atmosphere) ranging from 12.4 to 24.9 Pa scale (-0.02 to -0.05 inches
watergage (wg)) in the shop spaces.
a. Maintain the pressure in decontamination areas, the equipment room,
and dirty locker rooms within a range of -2.49 to -9.96 Pa (-0.01 to -0.04
inches wg). Maintain the pressure in clean spaces within a range of +4.98
to +12.4 Pa (+0.02 to +0.05 inches wg). For further replacement air
system criteria, see paragraph 2-4.5.
See paragraph 2-4.5 for further details.
Heating and Air Conditioning
. If necessary, provide heating and cooling
according to MIL-HDBK-1003/3.