Ventilation system for cooking unit

Claim 1

IN A VENTILATING SYSTEM ADAPTED TO BE ARRANGED ABOVE A COOKING UNIT IN CLOSE PROXIMITY THERETO AND TO REMOVE FROM THE SURROUNDINGS THEREOF VAPORS AND GASES EMANATING THEREFROM, SAID VENTILATING SYSTEM INCLUDING A VENTILATING DUCT FOR CONVEYING A CURRENT OF AIR, SAID DUCT INCLUDING AN INLET PORTION LOCATED ABOVE SAID UNIT, AND MEANS ASSOCIATED WITH SAID DUCT AND REMOTE FROM SAID INLET PORTION FOR INDUCING A CURRENT OF AIR TO PASS OVER SAID COOKING UNIT THROUGH SAID INLET PORTION AND OUT THROUGH SAID DUCT, MEANS FOR REMOVING OIL AND GREASE FROM SAID CURRENT OF AIR COMPRISING A FLOW-THROUGH GREASE FILTER COMPRISING ONE OR MORE FILTER ELEMENTS EACH COMPRISING A FIBROUS MAT RETAINED IN A FRAME AND PRESENTING A PAIR OF SUBSTANTIALLY PARALLEL PLANER SURFACES ADAPTED TO INTERCEPT A FLOW OF AIR, SAID FILTER ARRANGED ACROSS SAID DUCT FROM WALL TO WALL THEREOF IN A MANNER WHEREBY ANY AIR PASSING THROUGH SAID DUCT PASSES THROUGH AT LEAST ONE SAID FILTER ELEMENT, SAID FILTER BEING LOCATED IN SAID DUCTS AS CLOSE TO THE SAID INLET THEREOF AS PRACTICABLE, SAID FILTER ELEMENTS BEING SO ORIENTED THAT THE PLANER SURFACES THEREOF EXTEND AT AN ANGLE OF ABOUT 45* TO THE VERTICAL; A MANIFOLD MOUNTED WITHIN SAID DUCT AT A POSITION ABOVE SAID FILTER, SAID MANIFOLD PROVIDED WITH A PLURALITY OF SPRAY FORMING ELEMENTS AND ADAPTED TO SPRAY A HOT LIQUID ON SAID FILTER FOR WASHING OIL AND GREASE THEREFROM, SAID SPRAY FORMING ELEMENTS FORMING A SPRAY PATTERN OF SAID HOT FLUID COVERING THE ENTIRE EXPOSED SURFACE OF SAID FILTER ADJACENT SAID MANIFOLD; AND DRAIN MEANS WITHIN SAID DUCT BELOW SAID FILTER FOR COLLECTING SAID LIQUID AFTER SAID LIQUID LEAVES SAID FILTER AND FOR REMOVING SAID LIQUID FROM SAID DUCT.