F - Mech Eng,Light,Heat,Weapons – 24 – H
Patent
F - Mech Eng,Light,Heat,Weapons
24
H
F24H 9/20 (2006.01) F23J 13/00 (2006.01) F23L 11/00 (2006.01) F23M 9/00 (2006.01) F24H 1/18 (2006.01)
Patent
CA 2252335
A vent damper is provided for limiting the flow of ambient air through the central core of a hot water heater having a combustion chamber, the central core forming an exhaust port leading to an exhaust duct for evacuation of exhaust gases from the combustion chamber. The vent damper includes an annular base having an upwardly facing opening forming a passageway therethrough for passage of the exhaust gases from the exhaust port to the exhaust duct. A poppet is pivotally supported above the annular base means to pivot between a closed position closing the passageway and a open position opening the passageway. The poppet is configured such that the exhaust gases generated in the combustion chamber and passing out of the exhaust port cause the poppet to pivot into the open position such that the gases may flow through the passageway. The weight of the poppet is distributed about a pivot such that in the absence of the gases, it falls under the influence of gravity into the closed position to limit the flow of ambient air through the central core. A down draft hood is disposed between the poppet and the exhaust duct to provide down draft protection. The down draft hood includes side ports to allow the gases to flow from the exhaust port to the exhaust duct when the passageway is open. The down draft hood permits operational lifting of the closure element even in a downdraft situation. A flue hood covers the down draft hood.
Gowling Lafleur Henderson Llp
Schimmeyer Werner K.
LandOfFree
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