F - Mech Eng,Light,Heat,Weapons – 24 – D
Patent
F - Mech Eng,Light,Heat,Weapons
24
D
98/15, 126/22
F24D 5/00 (2006.01) F24D 5/04 (2006.01)
Patent
CA 1213185
A B S T R A C T In this invention a forced air, oil-fired, central home-heating fur- nace is modified by a draft valve installed in an outside wall of its return air chamber. Operation of such draft valve is synchronized with operation of the furnace fan, so that the draft valve is closed when the furnace fan is in operation, but open during the periods when the furnace fan is at a standstill, allowing thus ambient indoor air to enter the hea- ting system extract residual heat, and transfer it into an upper heated space by means of natural convection. Such modification reduces waste of residual heat, without causing counter-productive effects of continuous forced air circulation.
472077
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