Thermiser Patent

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Here is a United States Patent assigned to the Thermiser Manufacturing Corporation for a flue box assembly, dated January 30, 1979.

"In summary, the present invention provides an improved flue box assembly which is designed to be positioned along the exhaust line emanating from a furnace box, such that the exhaust conduit emanating from the furnace box forms the inlet conduit into the flue box assembly, and wherein the flue box assembly is formed by a housing having a greater diametric sizing than either the waste gas outlet emanating from the furnace, or the outlet conduit emanating outwardly from the flue box assembly. The flue box assembly is formed by a housing which includes a damper plate pivotally mounted therein which is apertured to provide a flue opening, of a smaller diametric sizing than either the inlet or outlet apertures formed in the top and bottom walls thereof, while at the same time being pivotally movable to an open position which thereby exposes an opening of greater dimeatric housing relative to either the inlet or outlet apertures to accommodate a back pressure or explosive occurrence in the furnace box. The flue box assembly of the present invention provides for a more efficient burning of the fuel gases contained in the furnace, while at the same time permitting the safe and efficient and virtually instaneous exhausting of the gases in a back pressure or explosive situation involved in the furnace box."

Thanks to Gerry Gill for finding and sharing this patent with us.