Dual air flow fan for circulation of heated air in a forced air heating apparatus.

摘要

A forced air circulation heating apparatus (10) in which an air stream is heated at a first location (50, 51) in a conduit means and transported to a second location (40) within the apparatus by the conduit means and is forced into a heating compartment and mixed with a recirculated forced air flow within the compartment. A valve or controller means (154) can be used to vary the proportions of the heated air stream and the recirculated forced air flow which are combined within the heating compartment. The air conduit and the heating compartment can have a common wall whereby the heated air stream indirectly heats the heating compartment. A duel flow impeller fan (102) is used to move the heated air stream and to establish the recirculated forced air flow within the heating compartment. The fan operates with a single electric motor (98). The heating compartment is vented to a flueway (150).