Flue box assembly

Stoves and furnaces – Dampers – Stovepipe

Patent

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Details

98 78, 236 49, F23L 1100, F23L 1300

Patent

active

041366760

ABSTRACT:
There is disclosed an improved flue box assembly which consists of a housing formed by a continuous sidewall, a top wall and a bottom wall, each of the top wall and bottom wall having an aperture disposed therein, the interior diametric sizing of the housing being substantially greater than both the top wall and bottom wall apertures, and the housing including a damper plate pivotally mounted interioraly thereof and spaced between the top and bottom wall respectively, the damper plate further including a flue opening having a diametric sizing substantially smaller than the top and bottom wall apertures, and the damper plate being constructed and accommodated to be movable between an open position and a closed position, such that when the damper plate is in the closed position, the flue opening is interposed between the top wall aperture and the bottom wall aperture and insures a maximum burning of the fuel in the corresponding furnace, while alternatively, under back pressures or an explosion condition, the damper plate is permitted to move into the full open position and expose the substantially greater diametric sizing of the flue box in order to permit an efficient emission of flue gases from the furnace. The relationship between the various size openings as between the top and bottom wall apertures, the interior diametric sizing of the housing, and the flue opening in the damper plate insures substantially complete combustion of the fuels in the furnace while at the same time accommodating the requirement for a quick, safe and efficient exhaust of flue gases under back pressure or explosive conditions. SU

REFERENCES:
patent: 526828 (1894-10-01), Bell
patent: 1196117 (1916-08-01), Kiefer
patent: 1580106 (1926-04-01), Allie
patent: 1901821 (1933-03-01), Provincial
patent: 1957197 (1934-05-01), Bridge
patent: 2117672 (1938-05-01), Linhard
patent: 2222663 (1940-11-01), Handley
patent: 2371677 (1945-03-01), Crooker
patent: 3912223 (1975-10-01), Iwata

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