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US 4,541,409 AGranted
Backshelf compensating exhaust hood apparatus
AssigneeMaysteel Corporation
InventorsDaniel Karst, Gary Strege, E. Richard Larsen
Life of this patent
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AssigneeMaysteel Corporation
InventorsDaniel Karst, Gary Strege, E. Richard Larsen
Estimating the term…
A backshelf compensating exhaust hood includes an upper wall passageway for forming and redirecting an induction air stream into and through an exhaust chamber to an exhaust passageway, the upper wall passageway extends through the upper wall to a smooth curved reverse passageway redirects the air into a short slot which discharges a stream into the upper end of the exhaust chamber. A forward tilted filter is located in the exhaust chamber to form the back wall of the exhaust chamber and with the lower end spaced inwardly of the upper end and with the upper portion aligned with the induction air stream. The filter is oriented to define an essentially right angle with the interior upper wall of the exhaust chamber. The top wall of the exhaust chamber extends inwardly and upwardly slightly to the filter. The induction air supply passageway is a relatively large passageway which has a depth which is a multiple of the depth of the slot. The inlet expands slightly to the deflector and reverse passageway to the discharge slot. The discharge slot includes a short extension of the deflector wall as an essentially flat wall which extends parallel to the top wall of the exhaust chamber. For a gas fired unit, an exhaust duct is located to the backside of the hood for upwardly spaced alignment with flue duct of the equipment. The spaced exhaust duct of the hood projects upwardly into the exhaust passageway for exhausting of the combustion gases and the secondary air introduced between the flue duct and the exhaust duct.
A compensating back-shelf exhaust hood comprising a hood enclosure having a top wall means and a partially enclosing side wall means arranged to form an open-bottom exhaust chamber and having an opening in the side wall means for access into the enclosure, an air supply channel means having a first portion extending through the top wall means and receiving forced air and directing the air received to the front of said top wall means along a substantial portion of the length of said top wall means;
A compensating exhaust hood apparatus for exhausting of the environment over a horizontal work area, comprising an exhaust passageway means having means for mounting adjacent the rear portion of the work area and including a generally vertically disposed exhaust opening means, a top wall unit having means for mounting in overlying vertically spaced relation to the work area and extending forward of said exhaust passageway means to define an exhaust chamber overlying the work area, said top wall unit including a plurality of spaced walls defining an air supply channel extending from the rear portion to the front portion of the top wall unit, air supply means coupled to said supply channel and adapted to establish a high velocity air flow therethrough, a reverse deflector means connected to the forward end of the channel and including an essentially continuously smooth and curved passageway, a slot means connected to the curved deflector means and extending upwardly and rearwardly into the exhaust chamber and redirecting the air as a relatively narrow air stream extending over the work area within the upper end of the exhaust chamber and into said exhaust opening means, a filter means angularly oriented with the top portion located forwardly of the lower portion, and said slot means being angularly oriented whereby said air stream engages said filter means essentially perpendicular to the filter means.
A compensating exhaust hood for gas-fired equipment having a vertical exhaust flue means, comprising a hood enclosure having a top wall means and a partially enclosing side wall means arranged to form an open-bottom exhaust chamber and having an opening in the side wall means for access into the enclosure, an air supply channel means having a first portion extending through the top wall means and receiving forced air and directing the air received to the front of said top wall means along a substantial portion of the length of said top wall means;
Dependencies are inferred from the claim text.