Update. Inavy is filter air 17.75x18
No other part numbers with same form, fit, and function found.
A replaceable device designed to remove dust, pollen or other foreign matter from the air passing through it. The removal of particles is accomplished by porous material (metallic or non-metallic), wire mesh, or the like. It is designed to fit into an air cleaner, intake.
Classification: Filtering or purifying machinery and apparatus for gases, nesoi
NSN 5999-00-499-6172
NSN 5965-01-074-7306
NSN 6110-00-907-8399
NSN 6620-01-026-7371
NSN 5920-00-199-9514
NSN 6610-01-658-3664
NSN 5985-01-238-3326
NSN 6110-01-239-4180
NSN 6685-01-541-9538
NSN 6620-01-072-1034
NSN 5925-01-446-7461
NSN 5915-01-224-7044