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A vented, gas-fired air heater especially designed for temporary heating applications includes an improved burner design providing effective air and gas mixing and efficient burning in the combustion chamber. Highly efficient heat exchanger including corrugated heat exchanger panels provides enhance

A vented, gas-fired air heater especially designed for temporary heating applications includes an improved burner design providing effective air and gas mixing and efficient burning in the combustion chamber. Highly efficient heat exchanger including corrugated heat exchanger panels provides enhanced heat transfer characteristics.

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1. A gas burner comprising first and second spaced parallel burner plates defining a shallow chamber therebetween, each burner plate having a plurality of spaced apart extended openings therethrough defined by respective short tubular collars projecting therefrom with each of the tubular collars of

1. A gas burner comprising first and second spaced parallel burner plates defining a shallow chamber therebetween, each burner plate having a plurality of spaced apart extended openings therethrough defined by respective short tubular collars projecting therefrom with each of the tubular collars of the first plate being aligned with and directed toward and in confronting relation to a respective one of the tubular collars of the second plate such that annular gaps are defined between adjacent end portions of the tubular collars of the first and second plates; a conduit to supply gaseous fuel into said shallow chamber defined between said parallel plates such that, during use, the fuel passes through said annular gaps; a burner blower arranged to supply a flow of combustion air in a direction toward said plates such that the combustion air passes downstream firstly through the tubular collars of the first burner plate to mix with the gaseous fuel passing through said annular gaps to provide a combustible fuel-air mixture and thence through the tubular collars of the second plate, wherein the tubular collars of the first burner plate define flow passages of smaller diameter than those defined by the tubular collars of the second plate thereby creating a venturi-like flow action as the combustion air passes through the aligned tubular collars and thus promoting thorough mixing of the air and the fuel being supplied via said annular gaps. 2. The gas burner of claim 1 wherein said short tubular collars are integrally formed with their respective burner plates as by a punching or, alternatively, said burner plates are made by a casting process. 3. The gas burner of claim 1 wherein said burner plates are of generally circular outline, with said conduit to supply gaseous fuel being connected centrally of said plates to supply the fuel to the chamber defined between said plates. 4. The gas burner of claim 3 wherein said conduit has an end portion centrally disposed between said burner plates and having a plurality of radially arranged openings to assist in providing even distribution of gaseous fuel to said chamber. 5. The gas burner of claim 3 wherein said burner blower includes a vaned rotor mounted for rotation on an axis generally centered with said burner plates and extending normal thereto, and air flow confining structures shaped to direct the air flow from said rotor generally along said axis whereby to deliver a generally even and balanced flow toward the burner plates to promote even flow distribution through said openings therein. 6. A gas burner including an enclosure defining a path for movement of combustion air, a pair of generally parallel burner plates disposed transverse to the path of combustion air travel, said burner plates comprising a first burner plate located upstream of a second burner plate relative to the flow direction of combustion air when in use and spaced apart to define a shallow chamber therebetween, both plates having a plurality of openings therein allowing for passage of combustion air therethrough, the openings in said first plate being aligned with respective ones of the openings in said second plate to provide annular gaps allowing exit of gaseous fuel from the shallow chamber, a conduit to supply gaseous fuel into the shallow chamber defined between said burner plates, wherein said openings in said plates are in the form of short tubular collars projecting from said plates with the tubular collars of both plates being aligned with and directed toward each other in confronting spaced apart relation and wherein the tubular collars of the first burner plate define flow passages of smaller diameter than those defined by the tubular collars of the second plate thereby creating a venturi-like flow action as the combustion air passes through the aligned tubular collars thus promoting thorough mixing of the air and the gaseous fuel being supplied via said annular gaps, and allowing a reduced gas supply pressure to the shallow chamber between the burner plates as the venturi action pulls the gaseous fuel into the combustion air streams thereby to provide a combustible fuel-air mixture downstream of said burner plates. 7. The gas burner of claim 6 wherein said short tubular collars are integrally formed with their respective burner plates as by a punching action or alternatively said plates are formed by a casting process. 8. The gas burner of claim 6 wherein said burner plates are of generally circular outline, with said conduit to supply gaseous fuel being connected centrally of said plates to supply the fuel to the chamber defined between said plates. 9. The gas burner of claim 8 wherein said conduit has an end portion centrally disposed between said burner plates and having a plurality of radially arranged openings to assist in providing even distribution of gaseous fuel to said chamber. 10. The gas burner according to claim 6 including a burner blower communicating with said enclosure to provide for movement of combustion air along said path of travel toward said burner plates. 11. The gas burner according to claim 8 including a burner blower communicating with said enclosure to provide for movement of combustion air along said path of travel toward said burner plates. 12. The gas burner of claim 10 wherein said burner blower includes a vaned rotor mounted for rotation on an axis generally centered with said burner plates and extending normal thereto, and air flow confining structures shaped to direct the air flow from said rotor generally along said axis whereby to deliver a generally even and balanced flow toward the burner plates to promote even flow distribution through said openings therein. 13. A gas burner including a pair of generally parallel burner plates adapted to be disposed transverse to a path of combustion air travel when in use, said burner plates comprising a first burner plate located upstream of the second burner plate relative to the direction of combustion air flow when in use, said plates spaced apart to define a shallow chamber therebetween with both plates having a plurality of openings therein allowing for passage of combustion air therethrough, the openings in of said first plate being aligned with respective ones of the openings in the second plate, said openings in said plates being in the form of short tubular collars projecting from said plates with the tubular collars of both plates being aligned with and directed toward each other in confronting spaced apart relation to provide annular openings allowing exit of gaseous fuel between the confronting spaced apart collars wherein the tubular collars of the first burner plate define flow passages of smaller diameter than those defined by the tubular collars of the second plate thereby creating a venturi-like flow action as the combustion air passes through the aligned tubular collars, a conduit to supply gaseous fuel into the shallow chamber defined between said burner plates, such that, in use, combustion air moving along the path and through the aligned openings in said venturi-like flow to promote thorough mixing of the air and the fuel being supplied via said annular gaps and allow a reduced gas supply pressure to the shallow chamber between the burner plates as the venturi action pulls the gaseous fuel into the combustion air streams thereby to provide a combustible fuel-air mixture downstream of said burner plates. 14. The gas burner of claim 13 wherein said burner plates are of generally circular outline, with said conduit to supply gaseous fuel being connected centrally of said plates to supply the fuel to the chamber defined between said plates. 15. The gas burner of claim 14 wherein said conduit has an end portion centrally disposed between said burner plates and having a plurality of radially arranged openings to assist in providing even distribution of gaseous fuel to said chamber.