[ Air filtering installations; Air purifying apparatus and machines; Aquarium filtration apparatus; Bed warmers; Boilers for heating installations; Coffee filters not of paper being part of electric coffee makers; Component parts of water cooling towers in the nature of wire mesh hangers for securing slat fill; Cooling installations for water; Disposable sterilization pouches, not for medical use; Electric footwarmers; Electric radiators; Electric stoves; Electro-chemical flue gas scrubbing machines; Filters for air conditioning; ] Filters for drinking water; [ Germicidal lamps for purifying air; Heating boilers; Heating cushions not for medical purposes; Heating installations; Heating pads not for medical purposes; HEPA filters for household use; Hot water bottles; Industrial air filter machines; Ionization apparatus for the treatment of air; Non-electric pocket warmers, namely, chemically-activated heating packets for warming hands; Oil purifying installations; Pasteurizers for use in food, beverage, pharmaceutical; Pipes being parts of sanitary facilities; Pipes for heating boilers; Sewage disposal plants; Sewage purification installations; Swimming pool chlorinating units; Water desalination plants; ] Water filtering apparatus; Water purification installations; Water purifying apparatus; Water purifying units, for potable water for domestic use; [ Water softening apparatus and installations; ] Water sterilizers