Combustion air vent with automatic lock

Details Combustion air vent with automatic lock Combustion air vent with automatic lock

1986-07-10

1988-02-09

Yeung, James C.

Stoves and furnaces

Liquid heater

98119, 126143, 126285R, 237 51, 237 46, F24B 118

Patent

active

047235330

ABSTRACT:
An air vent for supplying air for combustion to a fireplace or the like inside a building, the vent comprising a duct having an inlet end outside the building and an outlet end inside the building, a cover hingedly mounted over the outlet and pivoting between an open position and a closed position covering the outlet, the cover being sufficiently light that a pressure differential caused by combustion inside the building maintains the cover open. A tab, having a portion of hook-and-loop type fastening material, depends from the cover and a patch of mating hook-and-loop type fastening material is positioned adjacent the outlet end to engage the tab. The cover is sufficiently heavy that when the pressure differential drops the cover falls with sufficient force to engage the tab and patch, locking the cover closed.

REFERENCES:
patent: 2251916 (1918-01-01), Parsons
patent: 3250206 (1966-05-01), Strouth
patent: 3541945 (1970-11-01), Wexler
patent: 4231516 (1980-11-01), Weingartner
patent: 4498624 (1985-02-01), Kogut

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