3 inch diameter; stainless 316 (1613ss); 3 holes (0.375) equally spaced
A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 6650-01-460-0330
NSN 5915-00-420-1557
NSN 5930-01-601-9528
NSN 7035-01-103-6845
NSN 4140-01-400-3610
NSN 4140-01-123-9149
NSN 5835-01-416-6455
NSN 5915-01-166-3621
NSN 5915-00-865-7977
NSN 5965-00-181-0213
NSN 4140-01-290-0164
NSN 5855-01-120-7831