11 (Based on Use in Commerce) Air cooling apparatus; Ventilators for commercial, industrial and domestic use; Electric heating fans; Water cooling towers (Based on 44(e)) Filters for drinking water; Water treatment apparatus, namely, clarification and thickening machines for use in treatment of liquids in the nature of water, waste water and industrial water; Water treatment equipment, namely, water filtration units; Water treatment equipment, namely, water filtration units and reverse osmosis units; Water treatment equipment, namely, cartridge filtration units; Water treatment equipment, namely, chemical sterilization units; Water treatment equipment, namely, reverse osmosis filtration units; Water treatment equipment, namely, reverse osmosis units; Water treatment equipment, namely, ultraviolet sterilization units; Air filtering installations; Air filters for industrial installations; Apparatus for filtering drinking water; Heat exchangers not being parts of machines; Heat exchangers, other than parts of machines; Industrial air filter machines; Magnetic water treatment apparatus