11 Apparatus for heating, refrigerating, ventilating and air-conditioning, namely, water unit heaters, steam unit heaters, electric unit heaters, oil-fired unit heaters, gas-fired unit heaters, oil-fired furnaces, gas-fired furnaces, gas water heaters, electric water heaters, gas-fired boilers, oil-fired boilers, oil-fired water heaters, make-up air units, namely, air purification units, air conditioners, infrared units, namely, infrared radiators not for motors and engines, air handling units, namely, devices which are preparing air to have right parameters, namely, unit heaters, namely, portable electric heaters, unit coolers, namely, cooling units for industrial purposes, humidifiers, electric fans in one casing, heat pumps, split-systems, namely, air cooling devices, namely, air cooling apparatus; fan coil units, namely, water unit heaters and coolers, namely, water coolers and water heaters, mixing chambers, namely, chamber for mixing fresh and recirculated air, namely, air purifying apparatus, roof fans, namely, fans mounted on the roof to ventilate room in the nature of ventilating fans for commercial and industrial use, duct heaters, namely, gas and water heaters, namely, gas heaters for heating indoor spaces for mounting in duct installation of ventilation and air-conditioning system, ventilation and air-conditioning installations, heat pumps, and regenerators, namely, rotary heat, exchangers, cross heat exchangers, copper or aluminum heat exchangers, aluminum heat exchangers, steal heat exchangers; ice water units, chillers, namely, refrigeration equipment in the nature of beverage chilling units; fans, namely, electric fans, tangential electric fans, axial electric fans, crossflow electric fans, centrifugal electric fans, namely, electric plug fans; radiators; air-purifying, air filtering, sterilizing, drying, and humidifying apparatus, namely, ventilation apparatus in the nature of a cordless floor drying cone dolly, humidifiers, dehumidifiers; fittings and automatic devices for apparatus for heating, refrigerating, ventilating and air-conditioning, air-purifying, filtering, sterilizing, drying and humidifying apparatus, namely, water unit heaters, steam unit heaters, electric unit heaters, oil-fired unit heaters, gas-fired unit heaters, oil-fired furnaces, gas-fired furnaces, gas water heaters, electric water heaters, gas-fired boilers, oil-fired boilers, oil-fired water heaters, make-up air units, namely, air purification units, humidifiers, electric fans in one casing, heat pumps, split-systems, namely, air cooling devices, namely, air cooling apparatus; fan coil units, namely, water unit heaters and coolers, namely, water coolers and water heaters, mixing chambers, namely, chamber for mixing fresh and recirculated air