Oven heat exchanger and floor construction

In a convection oven including a baking chamber, a door providing access to the baking chamber, and a blower for circulating hot air along a heated air flow path that passes through the baking chamber, a heat exchanger comprising:

• a plurality of heat exchange tubes extending across a portion of the heated air flow path outside the baking chamber, the heat exchange tubes arranged to form first and second spaced apart vertical tube arrays, the tubes of the first tube array having respective axes that lie in a first substantially vertical plane and the tubes of the second tube array having respective axes that lie in a second substantially vertical plane, the spaced apart first and second vertical tube arrays defining a substantially vertical air flow path therebetween;
• and
• a baffle system associated with the plurality of heat exchange tubes.

28 The heat exchanger of claim 15, further comprising:

• a plurality of gas burners, each associated with a respective input end of a respective one of the heat exchange tubes for delivering combustion gases therethrough.

In a convection oven including a baking chamber, a door providing access to the baking chamber, and a blower for circulating hot air along a heated air flow path that passes through the baking chamber, a heat exchanger comprising:

• at least first and second tube assemblies, each assembly including:
• a plurality of heat exchange tubes fixed together into a unit, each heat exchange tube including an input end associated with a first linear segment, an output end associated with a second linear segment and a bend connecting the first linear segment to the second linear segment, the plurality of heat exchange tubes arranged vertically to align the first linear segments in a first plane and to align the second linear segments in a second plane, where the first plane is offset laterally from the second plane;
• where the first tube assembly is stacked atop the second tube assembly to align the first plane of the first tube assembly with the first plane of the second assembly and to align the second plane of the first tube assembly with the second plane of the second tube assembly.

In a convection oven including a baking chamber, a door providing access to the baking chamber, and a blower for circulating air along an air flow path through the baking chamber, a heat exchanger comprising:

• a plurality of heat exchange tubes extending across a portion of the air flow path outside the baking chamber, each heat exchange tube including an input end and an output end;
• a plurality of in-shot burners, each in-shot burner aligned for firing a flame into a respective one of the input ends;
• a burner housing positioned about the in shot-burners and configured to increase air velocity along a length of each in-shot burner for reducing candling at gas orifices that provide gas to the in-shot burners.