Noun
An opening, possibly covered by a grate or grill, possibly ducted, that allows air to circulate.
A device or valve that allows to air to be evacuated from a radiator or pipe in a heating system.
Synonyms: bleed valve, bleed nipple
Making a drastic decision, Zateyev ordered the engineering section to fabricate a new coolant system by cutting off an air vent valve and welding a water-supplying pipe into it. Source: Internet
Other interior differences included changing vinyl designs, gauge appearance, and air vent configurations in the dash. Source: Internet