Process ovens with gas/oil burners are commonly beneath wonderful pressure. In order to hold the smoke, fumes, merchandise of combustion and unstable natural compounds from bleeding into the surrounding area, an exhaust fan is used. This fan can be pretty small and is sized to in shape the quantity of sparkling air being furnished by means of the combustion blower. Electric aspect heaters use a small make-up air port and solely exhaust adequate air to keep impartial strain in the oven. In non-stop oven designs, the exhaust fan is placed at the severe bloodless cease of the oven in order to draw cool air into the oven to mood the exhaust air. It is frequent exercise in oven format to measurement the oven exhaust fan at 10% of the oven recirculation volume. This can be similarly subtle via splitting the exhaust quantity in 1/2 and the usage of two smaller followers in vestibules at the entrance and exit to a continuous oven. This exercise is idea to decrease warmness loss from the principal oven zone.