Apparatus and installations for ventilating, heating, cooling, drying, humidifying, dehumidfying and cleaning, including electrical cleaning apparatus included in this class; heat exchangers (not being parts of machines) for air and/or other gaseous media; ventilators; air supply and discharge valves; dampers for ventilating plants; ducts and channells for ventilating plants; dryers and conditioning plants for drying, moistening, demoistening and hardening, for treating cellulose and other fibrous materials, paper, cardboard carton, disintegrated cellulose, grain, lumber, veneer and board.

Centrifugal separators; machines and apparatus included in Class 7, all utilizing air flow, air cushion, air pressure, or suction techniques and all for use in conveying and precipitating fibrous or particle-shaped material

Installations for lighting, heating, refrigerating, drying, ventilating, including apparatus for conditioning air to other gases by heating, cooling, humidifying and dehumidifying, heat or moisture exchange and cleaning; channels and ducts incorporated in such apparatus; airborne conveying installations; heat exchangers not being parts of machines; warm air furnaces; fans, not for personal use; blowers, ventilators, air grilles, air valves, air dampers; air diffusers, dry or wet filters and separators, all being parts of the aforementioned installations; electrostatic precipitators; drying in the class for lumber, veneer, board sheets, cellulose, and other fibrous materials including paper, cardboard, grain; flash-dryers.

Resinous protective coating (not being a paint) for metal or concrete and being for building or construction purposes, said coating comprised of compounds or inert flakes and synthetic resin.