Patent CA-1147625-A (CA)
Inventor: JACKSON BERT W
IPC: F23L17/00
Filed: 1981-03-20
Granted: 1983-06-07
Abstract: ABSTRACT       A combination powered flue products exhaust and preheated combustion air supply assembly for use in association with a heating furnace so that flue exhaust products are given a positive exhaust to the outside while a balanced combustion air supply is positively pulled in-side. A compartmented main housing is provided having flue products exhaust and combustion air compartments provided therein. A double-shafted electric drive motor is mounted in the main housing which simultaneously drives a flue products exhaust fan provided in the flue products exhaust compartment and a combustion air intake fan pro-vided in the combustion air compartment. An outside air intake pipe is connected to the main housing and extends to the exterior of the building so as to deliver combustion air to the combustion air compart-ment. A combustion air supply duct is provided in association with the main housing so as to selectively deliver preheated combustion air to the furnace area upon activation of the combustion air intake fan. A dilution air manifold is provided on the main housing in open com-munication with the flue products exhaust compartment. The dilution air manifold is provided with an automatic dilution air control barometric damper so as to permit the selective introduction of dilution air there-unto. A flue products exhaust supply duct is provided in association with the dilution air manifold and the flue products exhaust outlet of the furnace so as to provide for delivery of flue exhaust products from the flue products exhaust outlet of the furnace to the dilution air mani-fold. A flue products exhaust pipe is connected at one end thereof to the main housing in open communication with the flue exhaust products compartment thereof. The flue products exhaust pipe is concentrically positioned within the outside air intake pipe and extends therethrough to the exterior of the building structure so as to deliver hot flue exhaust products from the flue products exhaust compartment to the outside atmosphere upon activation of the flue products exhaust fan. Curved steel deflector vanes are provided between the inside surface of the air intake pipe and the outside surface of the flue products exhaust pipe so as to enhance the transfer of heat from the outgoing flue exhaust products to heat the incoming combustion air passing simultaneously through the air intake pipe. A vertical stackhead assembly is provided at the external outlet end of the flue products exhaust pipe so as to diffuse flue exhaust products into the outside atmosphere while keeping outside precipitation from entering the flue products exhaust pipe. Selective adjustable air restrictor panels are provided in association with the main housing so as to selectively vary the size of the openings from the combustion air intake pipe into the combustion air compartment and from the dilution air manifold into the flue exhaust products compart-ment. An automatic air pressure controlled air intake damper is provided in the air intake pipe proximate to the main housing so as to close the air intake pipe when the fans are not running. An automatic air pressure controlled flue products exhaust damper is provided in the flue products exhaust pipe proximate to the main housing so as to close the flue products exhaust pipe when the fans are not running.