Wall thimble with outside air inlet

Details Wall thimble with outside air inlet Wall thimble with outside air inlet

2007-05-01

2010-02-23

McAllister, Steven B (Department: 3749)

Stoves and furnaces

Stoves

Heating

C126S084000, C126S094000, C126S02100R, C126S314000, C126S316000

Reexamination Certificate

active

07665457

ABSTRACT:
An improved wall thimble is useful as part of a venting apparatus for a direct vent heating appliance. Dual functionality is provided in a single wall thimble device by having a vent path for exhausting combustion by-products, and a separate air inlet path to draw in outside combustion air for use by the heating appliance. The wall thimble is formed as a two-part housing such that a first cylindrical portion can be inserted into a second cylindrical portion. When a smaller diameter exhaust pipe is routed through the cylindrical portions, an annular region is formed between the exhaust pipe and the cylindrical portions. A first air vent is formed in the first cylindrical portion to draw combustion air into the annular region from outside. A second air vent is formed in the second cylindrical portion to route the combustion air from the annular region to an opening in the housing where a combustion air inlet pipe is connected.

REFERENCES:
patent: 2755794 (1956-07-01), Wendell
patent: 5282456 (1994-02-01), Smelcer et al.
patent: 5399119 (1995-03-01), Birk et al.
patent: 5562088 (1996-10-01), Valters et al.
patent: 5715808 (1998-02-01), Wilhoite
patent: 6039041 (2000-03-01), Barth
patent: 6109339 (2000-08-01), Talbert et al.
patent: 6647977 (2003-11-01), Lesage

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