A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 5910-01-659-6355
NSN 6610-01-328-9088
NSN 6105-01-552-5660
NSN 6220-01-446-6430
NSN 6130-00-518-1884
NSN 5996-01-014-6103
NSN 5895-01-335-3277
NSN 6145-00-233-6010
NSN 6685-00-968-1953
NSN 6685-00-404-6499
NSN 5999-01-560-1188
NSN 5950-01-289-6056