11 SELF-CLEANING COOKING EXHAUST VENTILATORS FOR COMMERCIAL FOOD SERVICE APPLICATIONS, PARTS AND ACCESSORIES THEREFOR, NAMELY, POLLUTION CONTROL APPARATUS, NAMELY, MIST ELIMINATOR EXTRACTORS AND FIRE DAMPERS, UTILITY SUPPLY DISTRIBUTION SYSTEMS, COMPRISING GAS, WATER, STEAM AND CONDENSATE RETURN LINES, HOSES AND VALVES; WASHDOWN MANIFOLDS; NON-WASH BAFFLE FILTERING UNITS; FIXED BAFFLE FILTERING UNITS; COOKING HOODS; AND DRAINS