An/plt-4. Ssr name is screen, flame
A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 5990-01-478-8638
NSN 6610-01-646-9101
NSN 5985-01-532-9913
NSN 5960-01-546-2379
NSN 6240-01-239-4218
NSN 6110-00-722-8416
NSN 5925-01-513-1981
NSN 6145-00-392-1975
NSN 6110-01-025-6139
NSN 6135-00-086-7530
NSN 5985-01-255-5168
NSN 6620-01-090-3803