Patent ID: 6450874
Filing Date: 2002-09-17
Classification: F23L

Abstract:
A power draft system for maintaining draft in a flue for fuel burning appliances, the fuel burning appliances being located within a building, the flue extending from said fuel burning appliance to a location exterior to said building, the power draft system, comprising:a blower for extracting exhaust flue gases from said flue, said blower comprising a flue gas intake, a flue gas exhaust, a motor and an exhaust fan driven by said motor; and a cooling system for controlling the temperature of said motor, including a first coolant flow inducer operably coupled to said motor for providing a self-induced flow of coolant to said motor, and a second coolant flow inducer, independent of the operation of said motor, for selectively providing an externally assisted flow of coolant to said motor, whereby said cooling system is adapted for selectively controlling the temperature of said motor with self induced coolant flow, assisted coolant flow, or both.