| 摘要 |
An apparatus for reclaiming heat from and for controlling the flow of combustion gases passing through a flue from a heater to an exhaust stack. The apparatus includes an inner housing having first inlet and outlet openings. The first inlet opening is adapted for connection by one section of the flue to the heater, whereby combustion gases from the heater will enter the inner housing through the first inlet opening and will exit therefrom through the first outlet opening. An outer housing at least partially surrounds the inner housing, the said inner and outer housings being spaced one from the other to define an intermediate chamber which is in communication with the inner housing's first outlet opening. The outer housing is provided with a second outlet opening which is aligned with the first outlet opening and in communication with an integral damper housing which is in turn adapted for connection by another flue section to the exhaust stack. The inner housing contains mutually spaced heat transfer conduits through which a flow of ambient air is directed to reclaim heat from the combustion gases exiting from the heater. A damper in the damper housing is adjustable between an open position allowing combustion gases flowing from the inner housing to pass through the other flue section to the exhaust stack, and a closed position retarding the flow of gases therethrough. When the apparatus is employed in conjunction with a gas heater, the outer housing is preferably additionally provided with a second inlet opening open to the ambient air, thereby allowing the intermediate chamber to function as a draft diverter.
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