A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 5999-01-391-3177
NSN 5985-00-032-6428
NSN 6150-00-871-8088
NSN 5925-00-994-0405
NSN 6130-01-577-5776
NSN 6220-00-358-7334
NSN 6130-01-557-7128
NSN 6145-00-873-4808
NSN 6610-00-468-1958
NSN 5965-01-600-0566
NSN 6130-01-188-0332
NSN 6150-00-809-9114