Air vent

passage through which air may enter or escape

Ventilation is the intentional movement of air from outside a building to the inside. It is the V in HVAC. With clothes dryers, and combustion equipment such as water heaters, boilers, fireplaces, and woodstoves, their exhausts are often called vents or flues — this should not be confused with ventilation. The vents or flues carry the products of combustion which have to be expelled from the building in a way which does not cause harm to the occupants of the building. Movement of air between indoor spaces, and not the outside, is called transfer air.
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SFIATATOIO. CUNICOLO DI VENTILAZIONE. BOCCA D'AERAZIONE

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