TM-5-855-4
c. Doors will be provided with locks controlled from inside to prevent inadvertent opening from the
contaminated side. Airtight doors that will be used for normal egress and ingress will be Provided with
butyl rubber seals fitted in nonferrous metal strips that are readily adjustable and replaceable with the
door closed. Doors will swing into the higher pressure area to ensure better sealing. Mechanical closing
of pedestrian doors is not recommended. Mechanical operation will be limited to doors of excessive size
and weight, and mechanical controls will be located at the door. Remote audible and visual devices
indicating the position of doors will be used on all doors if necessary. Blastproof doors are covered in TM
5-858-5.
d. The M2
permeable membrane door (NSN 4240-00-891-4276) Shown in
figure 6-2 i
S obtained from
AMCCOM for use in decontamination facilities. The membrane consists of two vertical panels or flaps
of permeable elastic material stretched on a tubular hoop-frame assembly fitting the door frame. In the
center the flaps overlap but because of their elasticity can be momentarily separated by entering
personnel without much turbulence and without appreciable loss of interior pressure. At rest the
permeable panels will permit an airflow of 400 cfm at a pressure differential 0.1 in. wg as tested by
AMCCOM. See figures 6-1, 5-3, and 6-4 for M2 door location at inlet and exit of shower area.
6-2