Abstract: An oven (1) for baking foods having a baking cabinet (2), at least one door (3), a plurality of burners (4), a plurality of annular heat exchange tubes (6) for receiving in an annulus (7) at an intake end (8) combustion gases (5) from the burners (4), a flue (9) for conducting the combustion gases (5) out of the oven (1), and a blower device (11) for recirculating air from within the baking cabinet (2), over the heat exchange tubes (6) and back into the baking cabinet (2). In the improvement, a first bracket (20) is removably attached to the oven (1), a second bracket (21) is attached to the oven (1) and spaced a distance from the first bracket (20). A plurality of annular heat exchange tubes (6) are disposed between the brackets (20, 21) with the intake end (8) of each tube attached to the second bracket (21) and the discharge end (10) of each heat exchange tube (6) attached to the first bracket (20) so as to form a removable rack (25) of the heat exchange tubes (6).

Abstract: An efficient convection oven is described. The oven utilizes a single inlet centrifugal induced back draft fan disposed in a sidewall thereof between vertical burners and combustion chambers to constantly mix products of combustion from the combustion chambers with air from within the oven cavity and recirculate the same. The fan design of the instant invention permits air changes within the oven cavity in the range of 85 to 100 per minute and the vertical burner fan combustion chamber combination permits a dramatic increase in the rack space within the oven cavity for a given oven exterior envelope.