A compensating exhaust hood.

摘要

A backshelf compensating exhaust hood (1) includes an upper wall passageway (18) for forming and redirecting an induction air stream into and through an exhaust chamber (7) to an exhaust passageway (9), the upper wall passageway (18) extends through the upper wall to a smooth curved reverse passageway (19) redirects the air into a short slot (20) which discharges a stream (14) into the upper end of the exhaust chamber (7). A forward tilted filter (15) is located in the exhaust chamber (7) to form the back wall of the exhaust chamber (7) and with the lower end spaced inwardly of the upper end and with the upper portion aligned with the induction air stream (14). The filter (15) is oriented to define an essentially right angle with the interior upper wall of the exhaust chamber (7). The top wall (21) of the exhaust chamber (7) extends inwardly and upwardly slightly to the filter (15). The induction air supply passageway (18) is a relatively large passageway which has a depth which is a multiple of the depth of the slot (20). The inlet expands slightly to the deflector and reverse passageway (19) to the discharge slot (20). The discharge slot (20) includes a short extension of the deflector wall as an essentially flat wall (29) which extends parallel to the top wall (21) of the exhaust chamber (7). For a gas fired unit, an exhaust duct (35) is located to the backside (5) of the hood (1) for upwardly spaced alignment with flue duct of the equipment. The spaced exhaust duct (35) of the hood (1) projects upwardly into the exhaust passageway (9) for exhausting of the combustion gases and secondary air introduced between the flue duct and the exhaust duct.