Stoves and furnaces – Stoves – Heating
Patent
1999-05-19
2000-03-21
Lazarus, Ira S.
Stoves and furnaces
Stoves
Heating
126 80, 126312, 126318, F24C 300
Patent
active
060390417
ABSTRACT:
A sheet metal colinear-to-coaxial duct transition assembly for a fuel-fired, direct vent heating appliance is fabricated by providing a one-piece rectangular sheet metal plenum box having a rear wall with first and second circular openings therein, and an open front side. A separate rectangular front wall of the plenum box is also formed and has a circular opening therein. Prior to assembling the plenum box, a rearwardly projecting combustion air stub duct is secured to the rear plenum box wall at the first opening therein, and a forwardly projecting combustion air intake duct is secured to the front plenum box wall at the opening therein. Cooperating side edge portions and flange pockets on the front wall and the open side of the plenum box and then interlocked and crimped to complete the plenum box. A flue gas discharge duct is then extended rearwardly through the front air intake duct to cause a rear end portion of the flue gas discharge duct to project outwardly through the second opening in the rear plenum box wall, and secured to the rear wall so that a front portion of the flue gas discharge duct extends coaxially through the interior of the forwardly projecting air intake duct. The coaxial front ducts may then be connected to a coaxial vent termination assembly, and the rear duct portions may be connected to the colinear flue gas discharge and combustion air intake ducts of a fuel-fired, direct vent heating appliance.
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Cocks Josiah C.
Lazarus Ira S.
Selkirk, Inc.
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