0
sheet steel, copper, lead, aluminum and other common metals and installations for heating, refrigerating, drying, and ventilating namely, air conditioning units, double wall, namely, air-flow wall and plenums, blowers and draft fans, air handling equipment, radiators, air conditioning units and convector enclosures, cooling towers and controls, swamp coolers, residential, commercial and mobile kitchen equipment, food processing equipment, mixers, bakery equipment, commercial and industrial ovens, diffusers, namely, grilles, air registers and accessories therefor, cooling and refrigeration equipment and systems, display and walk-in coolers and freezers, lamps, lighting fixtures and light troffers, heating and cooling coils, heat exchangers and recovery units, portable, space, wall, baseboard and water heaters, commercial and industrial dryers, fan guards, exhaust, residential, commercial, industrial and roof fans, fireplaces and accessories therefor, chimney and vents and draft controls, filtration equipment, dust, fume and air pollution collectors and baghouses, blow pipes and accessories therefor, smoke screens, fire, volume and automatic dampers and decking, residential and industrial furnaces, duct and duct fittings and accessories therefor, spiral pipe and fittings, gravity and power ventilators, roof ventilators, ventilator louvers, louvers, and filters and accessories therefor