A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 6110-01-003-6717
NSN 7035-01-287-9817
NSN 6110-00-050-8074
NSN 5895-00-279-1485
NSN 5895-01-215-4618
NSN 5965-01-660-0727
NSN 5965-01-417-6946
NSN 5905-00-226-1098
NSN 5975-01-334-1000
NSN 6220-01-277-5812
NSN 6150-01-160-7244
NSN 6110-01-541-4930