Makeup air tempering for grease extraction ventilator

Abstract

A grease extraction ventilator includes a water bath or water sprays into or through which are directed the products of the gaseous stream rising from cooking equipment and which tends to maintain an ambient temperature. This water is pumped through a heat exchanger for a portion of incoming makeup air directed into the room, the remainder of which is directed toward the intake for smoke and the like, to reduce the amount of air withdrawn from the room by the suction blower. The heat exchanger may also be utilized at a desired location, within or outside of the room in which the ventilator is installed, to heat or cool air or other fluids for heating or other purposes. Air may be directed into the upper portion of the room, such as adjacent the ceiling through a horizontal slot which causes the air to move horizontally to mix with the highest temperature air in the room and flow to portions of the room spaced from the ventilator, thereby avoiding drafts blowing against the cooking personnel. An air chamber adjacent the ventilator has a front wall and a discharge outlet on the underside which directs makeup air toward the ventilator intake. To reduce an undesired flow of air from the lower edge of the front wall, which may produce a flow of smoke and the like into the room, an orifice adjacent the horizontal slot may direct makeup air downwardly along the front wall.