3 inch diameter; stainless (1615ss)
A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 5925-00-489-5427
NSN 5996-00-969-6422
NSN 6145-00-044-6673
NSN 5915-00-469-5765
NSN 6135-01-593-4212
NSN 5950-00-968-7913
NSN 5975-00-784-7979
NSN 5985-00-975-9728
NSN 6685-00-540-8929
NSN 5999-00-169-7058
NSN 6320-01-476-7702
NSN 5945-01-105-5257