A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 6105-01-291-7511
NSN 5855-01-316-9642
NSN 7035-00-371-7749
NSN 2925-00-105-3907
NSN 5950-01-476-7341
NSN 6135-01-032-8887
NSN 6145-01-594-2389
NSN 5920-01-010-1578
NSN 5985-00-990-7513
NSN 5950-01-393-9222
NSN 5835-00-164-7309
NSN 5998-01-260-8722