Abrégé

Provided is an oven that includes an oven chamber through which a product passes to be treated. An oven wall defines apertures through which the product passes to repeatedly enter and exit the oven chamber during treatment. A vestibule chamber is disposed adjacent to the oven wall and encloses a return air duct that draws in ambient air entering the vestibule chamber and the process gas entering the vestibule chamber from the oven chamber through at least one of the apertures in the oven wall. A nozzle is provided externally of the vestibule chamber and oven chamber in fluid communication with the return air duct. The nozzle receives gas drawn in by the return air duct and directs the combination generally toward at least one aperture formed in the vestibule chamber through which ambient air can enter the vestibule chamber to form an air curtain adjacent to the at least one aperture.

Classes IPC  ?

• F24F 9/00 - Utilisation de courants d'air comme écrans, p.ex. rideaux d'air
• F24C 15/32 - Aménagements des conduits pour gaz chauds, p.ex. dans ou autour des fours de boulangerie
• F24C 3/00 - Poêles ou fourneaux à combustibles gazeux