Hepa, niosh tc-21c-280
No other part numbers with same form, fit, and function found.
A self-contained unit designed for placement in the holder of a respirator or air line mask. It may consist of a filtering element of fibrous material such as felt, paper, or the like secured between two end plates; or it may be a cylindrical container of light weight construction having flat or slightly rounded ends which may be either perforated or of wire mesh, filled with charcoal or chemicals which absorb contaminants from the air passing through it. See also filter, respirator, air filtering.
NSN 5998-01-495-8901
NSN 6145-01-645-4736
NSN 6620-01-062-1662
NSN 6650-00-302-3707
NSN 5975-00-411-6294
NSN 5925-01-101-1857
NSN 4140-01-208-7480
NSN 6650-00-434-0188
NSN 5855-01-100-3272
NSN 6150-01-183-3134
NSN 6130-00-147-6739
NSN 5915-01-645-7880