11 apparatus for ventilating, namely, fans, recuperators, electric and gas water heaters for use in ventilation systems; heating boilers; radiators for central heating systems; radiator humidifiers for central heating systems; cooling equipment and installations for water; heat exchangers not being parts of machines; heat recovery units, namely, heat recovery ventilators; fans for air conditioning apparatus; water distribution installations,; heating elements; household and industrial installation air filters; regulating and safety accessories for gas apparatus, namely, pressure regulators for gas installations; commercial and industrial cookware, namely, gas boilers; gas clean-up devices, namely, gas injectors for disbursing solids and/or liquids for purification and sterilization purposes; gas scrubbers, namely, electro-chemical flue gas scrubbing machines; boiling equipment and installations, namely, boilers for heating installations; radiators; heating boilers; chimney flues; chimney flues for heating boilers; sauna bath installations; heating elements for baths; bath equipment, namely, shower and bath cubicles; air conditioning equipment; air conditioners for vehicles; solar collectors; fireplaces; air casings in the nature of chimney flues; air conditioning system hoods; suction hoods, namely, exhaust hoods for kitchens; cooling chambers, namely, cooling units for industrial purposes; solid, liquid and gas-fueled heating equipment, namely, heating furnaces for industrial purposes; hot water installations, namely, hot water tanks; fire bars; fireplaces; steam production installations, namely, apparatus for the exchange of substances and heat for use in the production of steam, for use in cooking and for use in refrigeration; automatic watering installations, namely, watering machines for agricultural purposes; air driers, namely, dryers for the removal of water vapor from compressed air and gases; mixer taps for water distribution ducts; sanitary installations in the nature of steam rooms; sanitary fittings, namely, pipes being parts of sanitary facilities; refrigerating cabinets; sewage treatment plants; waste water purification plants; water conditioning units; coils as part of heating and cooling installations; water decalcification instruments and devices, namely, tap water purifying apparatus; water sterilizers; drinking water filters; filters for air conditioning; humidifiers for central heating radiators; cooling installations for water; air conditioners; water conduits installations, namely, plumbing fittings in the nature of valves; clean chambers being sanitary installations, namely, clean rooms; gas condensers, other than parts of machines; boiler pipes for heating boilers; expansion tanks for central heating installations; air purifying apparatus and machines; air valves for steam heating installations; hot water heating tanks; air filtering installations; air conditioners; regulating accessories for water, gas or heating apparatus; drying apparatus and installation, namely, drying apparatus for use in heating, ventilation systems, air conditioning systems and refrigeration systems; air conditioning apparatus; ventilation and air-conditioning installations for vehicles; fans for air-conditioning apparatus; water purification installations for water supply; dampers for heating installations, namely, chimney dampers; pipe line cocks, namely, spigots; thermostatic valves being parts of heating installations