A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 6240-00-583-9863
NSN 6150-01-478-3558
NSN 6220-01-584-5521
NSN 5950-01-581-5104
NSN 5835-01-252-5879
NSN 4140-00-605-0396
NSN 5998-01-311-0563
NSN 6220-00-165-1509
NSN 6105-01-509-1672
NSN 5985-00-923-8383
NSN 5920-01-071-2577
NSN 4140-01-621-8556