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air cleaner
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Air Combat Command
air compressor
air conditioner
air conditioning
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air cover
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air current
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air division
Air drill
-- air duct --
air embolism
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air duct

Noun1.air ductair duct - a duct that provides ventilation (as in mines)
Synonyms: air passage, airway
air passage, airway, blowhole, breather, duct, register, schnorchel, schnorkel, snorkel, snorkel breather, upcast, vent, vent-hole, venthole, ventilation shaft

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