TM 9-4120-371-14
4-11. INSTALLATIONS THAT REQUIRE ACCESSORY ITEM BLAST DAMPER AND
FRESH AIR COVER
This paragraph is applicable only when the blast damper is to be used.
NOTE
These parts are supplied only when specified on air conditioner ordering data.
The blast damper is designed to close and keep contaminated air from being drawn in through the fresh air
intake after a distant nuclear blast shock wave. It will also close if wind gusts go above 79 mph. When
installations using blast dampers have more than one air conditioner, fresh air covers should be installed on
units not equipped with blast dampers. For inspection, testing, adjustment, disassembly, repair, and
reassembly, contact direct support maintenance. (See para 531.)
a. Installation blast damper
(1) Using screwdriver, remove five pan head screws and flat washers and four flat head screws from
fresh air (inlet) screen.
(2) Remove fresh air inlet screen. Store in safe place.
(3) Remove fresh air filter. Store in safe place.
(4) Using screwdriver, install blast damper assembly using same hardware that was removed from
fresh air (inlet) screen.