A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 5910-01-496-4762
NSN 6130-00-223-2099
NSN 5835-01-058-8011
NSN 6650-01-274-8586
NSN 6220-01-242-9901
NSN 6150-01-206-9661
NSN 6145-00-007-0396
NSN 5960-01-057-5802
NSN 5945-01-551-7889
NSN 6105-01-378-9039
NSN 5855-01-583-1037
NSN 5930-01-152-2621