H

HEATERS AND PARTS THEREOF, CHIMNEY PIPE CAPS, SADDLE STACKS, ROOF SADDLES, FORCED DRAFT HOODS, STOCK TANK HEATERS, FEED COOKERS AND PARTS THEREOF, FARM, COMMERCIAL AND INDUSTRIAL BUILDING VENTILATING SYSTEMS-NAMELY, VENTILATING UNITS INCLUDING EXHAUST AND CIRCULATING FANS, INTAKE UNITS FOR SUPPLYING FRESH AIR AND EXHAUST UNITS FOR THE REMOVAL OF STALE AIR, STOCK BARN AND POULTRY HOUSE VENTILATING CABINETS AND FAN UNITS, ROOF AND WINDOW VENTILATORS, AND CUPOLAS, FLUES, AND PARTS THEREOF