{{stallations for ventilating, apparatus for conditioning air or other gases by heating, cooling, humdifying, de-humidifying, heat exchange, moisture exchange, or by cleaning, and channels and ducts, all being parts of or fittings for such apparatus; heat exchangers (not parts of machines); warm air furnaces, fans, blowers, air girlles, air dampers, air valves, air diffusers, and filters, all included in Class 11 for the aforesaid goods