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A direct-fired make-up furnace comprises a cabinet which houses an air blower. A gas fired burner located in a sloped passage, which is formed by walls of a return air compartment and a by-pass air compartment, radiates heat at an angle relative to the blower. The return air compartment substantiall

A direct-fired make-up furnace comprises a cabinet which houses an air blower. A gas fired burner located in a sloped passage, which is formed by walls of a return air compartment and a by-pass air compartment, radiates heat at an angle relative to the blower. The return air compartment substantially blocks direct radiation of the burner. An exit opening of the by-pass air compartment is located between the burner and the blower.

대표청구항 ▼

An air furnace comprising: a housing including an air blower having a drive motor, said blower and drive motor being mounted in said housing; an air compartment in said housing formed by an air damper and enclosure wall; a heat generating device in said housing exuding radiant heat toward said blowe

An air furnace comprising: a housing including an air blower having a drive motor, said blower and drive motor being mounted in said housing; an air compartment in said housing formed by an air damper and enclosure wall; a heat generating device in said housing exuding radiant heat toward said blower; said air compartment substantially blocking direct heat radiation from said heat generating device to the drive motor of said blower and serving as guiding means for the air entering said blower. An air furnace comprising: a housing; an air blower within said housing; return and bypass air compartments within said housing for providing air to said air blower; a radiant burner within said housing for heating air provided to said air blower, said radiant burner being positioned in a radiant burner passage adjacent to the bypass air compartment, said radiant burner and radiant burner passage being positioned at an inclined angle to the horizontal; and an in-line damper for the bypass air compartment, said bypass air compartment having an exit opening for introducing air into the housing and an inlet opening for introducing air into the bypass air compatment, said in-line damper being positioned at said air inlet opening and having a free area substantially the same as the area of the exit opening, and wherein said bypass air compartment, said radiant burner, said radiant burner passage, and said return air compartment are positioned on a side of the housing opposite the side where said blower is located and wherein said radiant burner passage is located below said bypass air compartment and above said return air compartment.