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air compressorair conditioner
air conditioning
Air cooling
Air Corps
air cover
air crew
Air crossing
air current
air cushion
air defense
air division
Air drill
air duct
air embolism
Air engine
-- air filter --
air flow
air force
air force academy
Air Force Intelligence Surveillance and Reconnaissance
Air Force ISR
air force officer
Air Force Research Laboratory
Air Force Space Command
Air fountain
Air furnace
Air gap
Air gas
air group
air gun
Air hammer
Air hole
air filter
| Noun | 1. |  air filter - a filter that removes dust from the air that passes through itSynonyms: air cleaner |