Definition of "air filter" []

• A filter for removing dust and other particles from a stream of air, typically used in the air intake of an internal combustion engine, the output of an air compressor, the supply duct of a forced-air furnace, etc. (noun)

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• "The back door was actually open, as if to let warm summer air filter into the kitchen, which had wooden countertops and a rosy red-tiled floor."