Exhaust hood

Claim 1

In combination with a hot cooking surface that has a forward and a rearward edge and from which surface fumes arise; a roof that is disposed above said cooking surface; first and second power-driven blowers mounted on said roof, each of said blowers including an air inlet opening and an air discharge opening; a stack that depends from said roof; a hood disposed above said cooking surface, said hood defined by a pair of side walls, a forwardly disposed portion, and rearward surface defining means, a fume control assembly, said fume control assembly including: a. a duct longitudinally disposed in said stack and cooperating therewith to define a forward and rearward vertically extending cavity, said duct supported in a fixed position relative to said stack, said first and second cavities in communication with said discharge outlet of said first first blower, and said duct in communication with said air inlet opening of said second blower; b. an air cleansing assembly operatively associated with said duct, said air cleansing assembly removing grease from said fumes as the latter move upwardly therethrough; c. a back wall that extends downwardly from said duct, said back wall cooperating with said rearward surface defining means to define a first vertical cavity in communication with said rearward cavity, and an upwardly directed elongate first opening longitudinally disposed relative to said rearward edge of said hot cooking surface and adjacent thereto; and d. a downwardly and outwardly directed wall supported from said duct, said wall cooperating with said forward portion to define a second cavity and an inwardly directed second opening, said second cavity in communication with said forward cavity, said first blower when operating concurrently discharging air to said forward and rearward cavities for air to discharge concurrently from said first and second openings as first and second streams thereof, said first stream discharging upwardly and forwardly of said back wall at a sufficient velocity as to create a negative pressure zone adjacent thereto to draw said fumes rearwardly and upwardly across said cooking surface to subsequently discharge through said air cleaning assembly, said second stream discharging rearwardly at an angle to said first stream to direct any fumes arising from said cooking surface not already moving upwardly and rearwardly in a rearwardly moving direction to mix with said first stream and subsequently flow through said air cleansing assembly, and said second blower when operating maintaining a negative air pressure in said duct above said air cleaning assembly to encourage the flow of said first and second streams mixed with said fumes through said air cleaning assembly to remove a substantial quantity of grease therefrom prior to the air in said duct being discharged through said air discharge outlet of said second blower.