Definitions for "Air Vent"
A valved opening in the top of the highest drum of a boiler or pressure vessel for venting air.
A valve , either manual or automatic that is used to remove unwanted air from the highest point of a piping system.
Valve, either manual or automatic, to remove air from the highest point of a coil or piping assembly.
Small outlet, to prevent entrapment of gases.
Slot cut in face frame, toe kick, etc, to allow for ventilation of appliance, heating register, etc.
a little bit smaller than usual