Patent ID: 6860261

Claim:
A convection oven construction comprising a first wall structure forming a substantially closed oven cabinet ( 23 ) having a front portion ( 68 ), opposing sides ( 69 ), back wall ( 71 ) and to ( 73 ), a second wall structure ( 11 ) forming a substantially closed oven cavity ( 49 ) having an upper portion ( 21 ) and a lower portion ( 13 ), a HTA supply system mounted in said lower portion of said cavity for generating a rising HTA flow within said cavity means, air flow outlet structure ( 82 ) formed thru a lower section of said second wall structure ( 11 ), a discharge vent duct system ( 85 ) communicating with said outlet structure ( 82 ), said duct system ( 85 ) extending from said outlet structure upwardly to an upper portion of said cabinet and communicating with discharge vent means ( 51 ) and in said cabinet for discharging warm circulated air and combustion gases from said cavity to the atmosphere, whereby said duct system ( 85 ) operates as a chimney up through which said warm air and combustion gases are drawn and whereby circulation of fresh air into and out of said cavity is continued, and whereby said HTA from said supply system will rise into said upper portion of said cavity and then as it becomes cooler will gravitate downwardly into said lower portion of said cavity and exit thru said outlet structure ( 82 ), whereby said HTA will be forced to travel a longer residence path within said cavity and release a larger amount of heat energy into said cavity prior to discharge of said circulate air therefrom.