Bi-loop heat recovery system for an oil fired furnace

Claim 1

In a furnace located in an enclosure, the furnace having a burner, a blower coupled to the burner, an exhaust duct to convey products of combustion from the furnace to a stack, said exhaust duct having a barometric draft regulator, an improved system comprising: (a) heat exchange means which can be quickly and easily coupled to the exhaust duct to provide a first zone to carry the products of combustion, and a second zone in heat flow communication with the first zone to carry a stream of air; (b) first conduit means which can be quickly and easily coupled to provide gas flow communication between a point outside the enclosure and the second zone of said heat exchange means; (c) second conduit means which can be quickly and easily coupled to provide gas flow communication between said point outside the enclosure and the barometric draft regulator; and (d) third conduit means which can be quickly and easily coupled to provide gas flow communication between the second zone of said heat exchange means and the blower whereby air for combustion in the burner is supplied from said point outside the enclosure, and air is supplied to the barometric draft regulator from the same point outside the enclosure.