A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 5985-00-232-8105
NSN 6645-00-864-6794
NSN 5998-00-239-0308
NSN 6130-01-428-6756
NSN 6110-00-082-0268
NSN 5945-01-236-4533
NSN 6110-01-610-6952
NSN 5835-01-149-4005
NSN 5905-01-590-7690
NSN 5915-01-315-7433
NSN 5996-01-150-0759
NSN 5895-01-206-2664