A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 6130-01-025-9836
NSN 5910-01-327-4640
NSN 6135-00-643-4843
NSN 5925-01-323-1613
NSN 5960-00-197-6282
NSN 6685-01-554-6188
NSN 5975-01-171-3207
NSN 5930-01-025-1959
NSN 5945-01-240-2271
NSN 6105-01-318-5734
NSN 6135-00-808-5093
NSN 5945-01-436-5488