Air treatment means for domestic cooking appliances

Claim 1

A COOKING APPLIANCE COMPRISING, IN COMBINATION: STRUCTURE PROVIDING A HORIZONTAL COOKING PLATFORM HAVING AT LEAST ONE HEATING ELEMENT ON WHICH TO PLACE A COOKING VESSEL; STRUCTURE PROVIDING AN UPSTANDING WALL REARWARDLY OF SAID COOKING PLATFORM, SAID WALL HAVING AN AIR INLET OPENING; AN AIR BLOWER BEHIND SAID WALL, SAID BLOWER HAVING AIR INLET MEANS AND AIR OUTLET MEANS; WALL MEANS PROVIDING AN AIR INLET DUCT COMMUNICATING BETWEEN SAID BLOWER INLET MEANS AND SAID WALL OPENING; AIR FILTERING MEANS IN SAID INLET DUCT; MEANS PROVIDING A PASSAGE COMMUNICATING WITH SAID BLOWER OUTLET MEANS AND EXTENDING FORWARDLY OF SAID UPSTANDING WALL TO TERMINATE ABOVE SAID HEATING ELEMENT; MEANS FOR DISCHARGING A SHEET-LIKE FLOW OF AIR IN A GENERALLY FORWARD DIRECTION FROM SAID PASSAGE; AND MEANS FOR REVERSING THE DIRECTION OF TRAVEL OF SAID SHEET-LIKE FLOW WHEREBY SAID AIR IS CONFINED TO A PATH WHICH IS WHOLLY ABOVE AND SUBSTANTIALLY PARALLEL TO SAID COOKING PLATFORM AND ENTERS SAID AIR INLET DUCT THROUGH SAID WALL OPENING.