Exhaust hood with disposable filter assembly and filter-condition sensor
AssigneeStandex International Corporation
InventorsLeonard R. Lieblein, Raymond W. Rogers, William F. Harnesberger
Life of this patent
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Abstract
The invention of this application comprises a novel filter assembly including a charcoal filter and a fiberglass filter positioned within a housing. The fiberglass filter comprises a fiberglass mat mounted to a wire structure formed in an accordion-shape so as to increase the surface area of the fiberglass mat. The invention also comprises a novel sensor system for sensing when the grease filter and the filter assembly have been installed, for sensing when the filter assembly is about to require changing and for shutting down the exhaust hood when the assembly requires changing.
Claims11
An exhaust hood assembly for positioning above a cooking apparatus, comprising in combination:
- an exhaust hood defining an opened-ended compartment having an exhaust opening;
- fan means positioned within said compartment for drawing air into said opened end of said compartment and exhaust said air from said compartment via said exhaust opening;
- a filter assembly positioned across said opened end of said compartment for filtering vapors from said cooking apparatus;
- and
- control means for sensing vacuum created within said compartment upon operation of said fan means and for indicating proper operation of said filter assembly, said control means comprising a filter assembly vacuum switch positioned in fluid communication within said compartment which is presettable at a certain level of vacuum existing within said compartment such that said filter assembly vacuum switch is actuated when appreciable vacuum exists within aid compartment indicative of said filter assembly being properly installed, and said control means further comprising means for interrupting operation of said fan means if said filter assembly vacuum switch is not actuated.
Dependencies are inferred from the claim text.