(n.) A contrivance for effecting ventilation; especially, a contrivance or machine for drawing off or expelling foul or stagnant air from any place or apartment, or for introducing that which is fresh and pure.

aerator air conditioner air cooler air duct air filter air hole air passage air shaft air tube airway blower blowhole breathing hole chiller cold pack cooler cooling system electric fan exhaust fan fan flabellum ice bag ice bucket ice cube ice pack ice pail louver louverwork naris nostril punkah shaft spilehole spiracle surface cooler thermantidote touchhole transom vent ventage venthole ventiduct ventilating shaft water cooler wind tunnel windcatcher windsail windscoop wine cooler