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Reference.org
Trickle vent
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<p>A trickle vent is a very small[<i>quantify</i>] opening in a <a href="/facts/Window/d89WmHTN">window</a> or other <a href="/facts/Building_envelope/CMRlLol6">building envelope</a> component to allow small amounts of ventilation in spaces intended to be <a href="/facts/Naturally_ventilated/FA5yjCjU">naturally ventilated</a> when major elements of the design—windows, doors, etc.—are otherwise closed. Trickle vents are used extensively in <a href="/facts/Europe/DTAtrKfh">Europe</a> and are integrated into window frames to provide minimum ventilation requirements for naturally-ventilated spaces. </p>