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An air impingement conveyor oven incorporating a baking case having an interior space bordered by opposing longitudinal walls, opposing lateral walls, a ceiling, and a floor; an air plenum partitioning the baking case's interior space into an air impingement space and an air return space, the air pl

An air impingement conveyor oven incorporating a baking case having an interior space bordered by opposing longitudinal walls, opposing lateral walls, a ceiling, and a floor; an air plenum partitioning the baking case's interior space into an air impingement space and an air return space, the air plenum having at least a first intake port opening at the air return space, the air plenum further having a plurality of air impingement ducts extending into and opening at the air impingement space; a passive flow conduit opening the baking case, the passive flow conduit having an output end positioned at the return air space; a combustible fuel injector and igniter connected operatively to the passive flow conduit; and an air impelling fan mounted operatively within the baking case's interior space for recirculating impingement air from the air impingement space into the air return space, for drawing outside combustion air through the passive flow conduit, and for driving the air through the at least first intake port into the air plenum.

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1. An air impingement conveyor oven comprising: (a) a baking case having an interior space bordered by opposing longitudinal walls, opposing lateral walls, a ceiling, and a floor;(b) an air plenum partitioning the baking case's interior space into an air impingement space and an air return space, th

1. An air impingement conveyor oven comprising: (a) a baking case having an interior space bordered by opposing longitudinal walls, opposing lateral walls, a ceiling, and a floor;(b) an air plenum partitioning the baking case's interior space into an air impingement space and an air return space, the air plenum having at least a first intake port opening at the air return space, the air plenum further having a plurality of air impingement ducts extending into and opening at the air impingement space;(c) a first passive air flow conduit opening the baking case, the first passive air flow conduit having an output end positioned at the return air space;(d) combustible fuel injection and ignition means connected operatively to the first passive air flow conduit; and(e) air impelling means mounted operatively within the baking case for drawing impingement air from the air impingement space into the air return space, for drawing outside combustion air through the first passive air flow conduit into the air return space, and for driving said air through the air plenum's at least first intake port into the air plenum. 2. The air impingement conveyor oven of claim 1 wherein the first passive air flow conduit has an open intake end positioned outside of the baking case. 3. The air impingement conveyor oven of claim 2 wherein the first passive air flow conduit's open intake end comprises a blowerless air intake. 4. An air impingement conveyor oven comprising: (a) a baking case having an interior space bordered by opposing longitudinal walls, opposing lateral walls, a ceiling, and a floor;(b) an air plenum partitioning the baking case's interior space into an air impingement space and an air return space, the air plenum having at least a first intake port opening at the air return space, the air plenum further having a plurality of air impingement ducts extending into and opening at the air impingement space;(c) a first passive air flow conduit opening the baking case, the first passive air flow conduit having an output end positioned at the return air space; the first passive air flow conduit further having an open intake end comprising a blowerless air intake, the open intake end being positioned outside of the baking case;(d) combustible fuel injection and ignition means connected operatively to the first passive air flow conduit; and(e) air impelling means mounted operatively within the baking case for drawing impingement air from the air impingement space into the air return space, for drawing outside combustion air through the first passive air flow conduit into the air return space, and for driving said air through the air plenum's at least first intake port into the air plenum; the first passive air flow conduit further comprising a tube having an intake end and an intake chamber covering the tube's intake end, the first passive air flow conduit's open intake end comprising at least a first intake aperture opening the outer wall. 5. The air impingement conveyor oven of claim 4 further comprising aperture sizing means connected operatively to the at least first aperture. 6. The air impingement conveyor oven of claim 5 wherein the aperture sizing means comprises a valve. 7. The air impingement conveyor oven of claim 6 wherein the first passive air flow conduit opens the baking case at one of the baking case's opposing longitudinal walls. 8. The air impingement conveyor oven of claim 7 further comprising a ventilated control casing fixedly attached to an outer surface of one of the opposing longitudinal walls of the baking case, the ventilated control casing being positioned to shroud the first passive air flow conduit's open intake end. 9. An air impingement conveyor oven comprising: (a) a baking case having an interior space bordered by opposing longitudinal walls, opposing side walls, a ceiling, and a floor;(b) an air plenum partitioning the baking case's interior space into a high pressure air space and a low pressure space, the oven's conveyor extending through the high pressure air space, the air plenum having at least a first intake port opening at the low pressure air space, the air plenum further having a plurality of air impingement ducts extending into and opening at the high pressure air space;(c) a burner tube opening the baking case, the burner tube having an output end, the output end opening at the baking case's low pressure air space;(d) combustible fuel injection and ignition means connected operatively to the burner tube; and(e) a dual function blower operatively mounted within the baking case for drawing combustion air through the burner tube into the low pressure air space, and for drawing air from the low pressure air space into the air plenum's at least first intake port. 10. The air impingement conveyor oven of claim 9 wherein the burner tube has an open air intake. 11. The air impingement conveyor oven of claim 10 wherein the burner tube's open air intake comprises a blowerless air intake. 12. An air impingement conveyor oven comprising: (a) a baking case having an interior space bordered by opposing longitudinal walls, opposing side walls, a ceiling, and a floor;(b) an air plenum partitioning the baking case's interior space into a high pressure air space and a low pressure space, the oven's conveyor extending through the high pressure air space, the air plenum having at least a first intake port opening at the low pressure air space, the air plenum further having a plurality of air impingement ducts extending into and opening at the high pressure air space;(c) a burner tube opening the baking case, the burner tube having an output end, the output end opening at the baking case's low pressure air space;(d) combustible fuel injection and ignition means connected operatively to the burner tube:(e) a dual function blower operatively mounted within the baking case for drawing combustion air through the burner tube into the low pressure air space, and for drawing air from the low pressure air space into the air plenum's at least first intake port, the burner tube further having an open and blowerless air intake; and an intake chamber covering the burner tube's open air intake, and further comprising at least a first intake aperture opening the intake chamber. 13. The air impingement conveyor oven of claim 12 further comprising aperture sizing means connected operatively to the at least first intake aperture. 14. The air impingement conveyor oven of claim 13 wherein the aperture sizing means comprises a valve. 15. The air impingement conveyor oven of claim 14 wherein the burner tube extends through one of the baking case's opposing longitudinal walls. 16. The air impingement conveyor oven of claim 15 further comprising a ventilated control casing fixedly attached to an outer surface of one of the baking case's opposing longitudinal walls, the ventilated control casing being positioned to shroud the intake chamber's at least first intake aperture. 17. An air impingement conveyor oven comprising: (a) a baking case having an interior space bordered by opposing longitudinal walls, opposing lateral walls, a ceiling, and a floor;(b) an air plenum partitioning the baking case's interior space into an air impingement space and an air return space, the air plenum having at least a first intake port opening at the air return space, the air plenum further having a plurality of air impingement ducts extending into and opening at the air impingement space;(c) first and second passive air flow conduits opening the baking case, the first and second passive air flow conduits having an output ends positioned at the air return space, the first passive air flow conduit having an air cooled section positioned within the second passive air flow conduit;(d) combustible fuel injection and ignition means connected operatively to the first passive air flow conduit; and(e) air impelling means mounted operatively within the baking case for drawing impingement air from the air impingement space into the air return space, for drawing combustion air through the first passive air flow conduit into the air return space, for drawing cooling air through the second passive air flow conduit, about the first passive air flow conduit, and into the return air space, and for drawing said air through the air plenum's at least first intake port into the air plenum. 18. The air impingement conveyor oven of claim 17 wherein each passive air flow conduit has an open intake end positioned outside of the baking case. 19. The air impingement conveyor oven of claim 18 wherein each passive air flow conduit's open intake end comprises a blowerless air intake. 20. An air impingement conveyor oven comprising: (a) a baking case having an interior space bordered by opposing longitudinal walls, opposing lateral walls, a ceiling, and a floor;(b) an air plenum partitioning the baking case's interior space into an air impingement space and an air return space, the air plenum having at least a first intake port opening at the air return space, the air plenum further having a plurality of air impingement ducts extending into and opening at the air impingement space;(c) first and second passive air flow conduits opening the baking case, the first and second passive air flow conduits having output ends positioned at the air return space, the first passive air flow conduit having an air cooled section positioned within the second passive air flow conduit, each passive air flow conduit having an open intake end positioned outside of the baking case, and in each passive air flow conduit's open intake end comprising a blowerless air intake:(d) combustible fuel injection and ignition means connected operatively to the first passive air flow conduit; and(e) air impelling means mounted operatively within the baking case for drawing impingement air from the air impingement space into the air return space, for drawing combustion air through the first passive air flow conduit into the air return space, for drawing cooling air through the second passive air flow conduit, about the first passive air flow conduit, and into the return air space, and for drawing said air through the air plenum's at least first intake port into the air plenum; each passive air flow conduit comprising a tube having an intake end and a tube intake end covering intake chamber, each passive air flow conduit's open intake end comprising at least a first intake aperture opening said each passive air flow conduit's intake chamber. 21. The air impingement conveyor oven of claim 20 further comprising first and second aperture sizing means, the first and second aperture sizing means being respectively operatively connected to the first and second passive air flow conduits' intake apertures. 22. The air impingement conveyor oven of claim 21 wherein each aperture sizing means comprises a valve. 23. The air impingement conveyor oven of claim 22 wherein the passive air flow conduits open the baking case at one of the baking case's opposing longitudinal walls. 24. The air impingement conveyor oven of claim 23 further comprising a ventilated control casing fixedly attached to an outer surface of one of the baking case's opposing longitudinal walls, the ventilated control casing being positioned to shroud the first and second passive air flow conduits' open intake ends. 25. An air impingement conveyor oven comprising: (a) a baking case having an interior space bordered by opposing longitudinal walls, opposing side walls, a ceiling, and a floor;(b) an air plenum partitioning the baking case's interior space into a high pressure air space and a low pressure space, the oven's conveyor extending through the high pressure air space, the air plenum having at least a first intake port opening at the low pressure air space, the air plenum further having a plurality of air impingement ducts extending into and opening at the high pressure air space;(c) a burner tube opening the baking case, the burner tube having an output end positioned at the baking case's low pressure air space;(d) combustible fuel injection and ignition means connected operatively to the burner tube;(e) an air cooling tube further opening the baking case, the burner tube extending through the air cooling tube; and(f) a triple function blower operatively mounted within the baking case for drawing combustion air through the burner tube into the low pressure air space, for drawing cooling air through the air cooling tube about the burner tube and into the low pressure air space, and for drawing air from the high pressure air space into the low pressure air space and into the air plenum's at least first intake port. 26. The air impingement conveyor oven of claim 25 wherein the burner tube has an open air intake, and wherein the air cooling tube has an open air intake. 27. The air impingement conveyor oven of claim 26 wherein the burner tube's open air intake comprises a blowerless air intake, and wherein the air cooling tube's open air intake comprises a blowerless air intake. 28. The air impingement conveyor oven of claim 27 further comprising first and second intake chambers respectively covering the burner tube's and the air cooling tube's open air intakes, each intake chamber comprising at least a first intake aperture opening said each intake chamber. 29. The air impingement conveyor oven of claim 28 further comprising first and second aperture sizing means respectively connected operatively to the at first and second intake chambers' at least first intake apertures. 30. The air impingement conveyor oven of claim 29 wherein each aperture sizing means comprises a valve. 31. The air impingement conveyor oven of claim 30 wherein the burner and air cooling tubes extend through one of the baking case's opposing longitudinal walls. 32. The air impingement conveyor oven of claim 31 further comprising a ventilated control casing fixedly attached to an outer surface of one of the baking case's opposing longitudinal walls, the ventilated control casing being positioned to shroud the intake and air cooling tubes' open air intakes.