Drying apparatus for use in air-conditioning, heat recovery, air filtering and ventilating; devices and apparatus for industrial heat technology, including for industrial ventilating, air conditioning and cooling as well as room ventilation installations, namely, air-handling units, dehumidifiers, air handlers, precision air-conditioning units, fan convection heaters, convection heaters, installations for the cooling of water, heat pumps; heat exchangers and structural fittings for heat exchangers, other than parts of machines; air filters for industrial installations; air-conditioning installations; air treatment equipment, namely, ionization apparatus for the treatment of air; air humidification apparatus for use with air conditioning apparatus; hot air space heating apparatus for industrial purposes; ventilating installations, namely, ventilators for heat recovery; filter bags for ventilating installations, namely, filter bags for ventilating installations in air conditioning; filters for exhaust extractors being parts of household and industrial installations in the nature of rooftop grease containment system comprising an exhaust fan, grease deflector, and filter for trapping grease vented from rooftop exhaust fans for cooking areas within the building; air-conditioning apparatus; air cooling apparatus; ionization apparatus for the treatment of air; fans being part of air-conditioning installations; electrically powered fans for ventilation purposes; hot air space heating apparatus; electric air reheaters for commercial use; air sterilizers not for medical purposes; air dryers for the removal of water vapor from compressed air and gases; electric radiators; ventilating fans for household use and gymnasiums; heat regenerators; heat pumps; heat recovery apparatus, namely, heat recovery ventilator; heat accumulators; electric commercial and industrial water re-cooling system in the nature of air handling units; rotary heat exchangers not being parts of machines; air heating furnaces; fans for air conditioning apparatus; air control dampers, namely, control devices used in air ducts to regulate the flow of air; gas burners, heating boilers and water heaters; industrial treatment installations, namely, gas purification machines; industrial furnaces not for food or beverages; industrial installations for the extraction of gases, namely, extractor hoods for kitchens, installations for the extraction of gases from labs, namely, extraction hoods for fodder driers, cutting table extraction installations; water conditioning units; industrial treatment installations in the nature of installations for trapping impurities from molten metal, namely, melting furnaces, industrial furnaces; air purifying apparatus; air cleaning apparatus, namely, air exchangers for cleaning and purifying air; heating apparatus and drying apparatus, namely, hot-water space heater for industrial purpose; heating, ventilating and ambient air conditioning and purification equipment, namely, air purification units; structural parts and accessories for all the aforesaid goods, including all the aforesaid goods being custom-made