초록 ▼

An air filtration system for removing smoke and grease from cooking exhaust of ducted range hoods is disclosed. In particular, the system includes a coarse filter device fine filter device which substantially remove all of the cooking effluents from the cooking exhaust drawn into the system by a fan

An air filtration system for removing smoke and grease from cooking exhaust of ducted range hoods is disclosed. In particular, the system includes a coarse filter device fine filter device which substantially remove all of the cooking effluents from the cooking exhaust drawn into the system by a fan powered by a variable speed motor. A sail switch device is connected to the motor and is positioned in the system to determine the flow quantity of the air drawn into the system and to maintain this flow quantity at a substantially constant volume by controlling the speed of the motor device. A maximum speed of the motor is determined by an indicator device signaling an operator to change filters clogged with cooking particles.

대표청구항 ▼

An air filtration system for ducted range hoods comprising: (a) a housing having an inlet and an outlet; (b) motor means having a variable speed range and attached to said housing (c) a fan attached to said housing near said motor means and driven by said motor means for forcing air containing cooki

An air filtration system for ducted range hoods comprising: (a) a housing having an inlet and an outlet; (b) motor means having a variable speed range and attached to said housing (c) a fan attached to said housing near said motor means and driven by said motor means for forcing air containing cooking effluents through said air filtration system; (d) an air impingement plate having a surface area larger than a surface area of said inlet and positioned behind said inlet in said housing; (e) an oil mist filter bag system having a high loft surface area positioned between said impingement plate and said outlet in said housing to remove coarse cooking effluents from the air drawn through said system; (f) an electronic filter section means positioned between said oil mist bag filter system and said outlet of the housing for causing an electrostatic action to remove fine particles from the cooling effluent of the air drawn through the system; (g) a high efficiency particle arrestor filter section means positioned between said electronic filter section and said outlet for removing substantially all of said fine particles from the cooking effluent of the air drawn through the system; (h) sail switch means positioned between said high efficiency arrestor filter section means and said outlet of the housing, said sail switch means controlling the variable speed of said motor means whereby said flow quantity of said air is maintained at a substantially constant volume within a control range of said motor means; and (i) indicator means attached to said motor means for indicating a maximum speed of said motor means.