HI-PRES

air conditioning units for use on board ships and in buildings; ventilation, air conditioning and heating and cooling systems and parts thereof, for commercial and industrial use, comprised of ventilating fans, air heating coils with hot water, steam or electricity as the heating medium, air coolers with freon or chilled water as the cooling medium; air distributor cabinets and air diffusers, air filters for air conditioners, ventilating louvers, ventilating dampers, ventilating louvered dampers, ventilating louvered gateways, damper and louver locks, air mixers and ventilator hoods