Process ovens with gas/oil burners are normally under positive pressure. Exhaust fans are used to keep the smoke, products of combustion and volatile organic compounds from bleeding into the surrounding area. Exhaust fans are sized to match a portion of the amount of fresh air being introduced by the combustion blower. For example, electric element heaters use a small make-up air port and only exhaust enough air to maintain neutral pressure in the oven. In continuous oven designs, the exhaust fan is located at the extreme end of the oven in order to draw cool air into the oven to temper the exhaust air. It is common practice in oven design to size the exhaust fan at 10% of the oven recirculation volume. Mechanovent supplies fans and fan components to a wide variety of OEM oven manufacturers.
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