Air heating apparatus; Refrigerating appliances and installations; Drying apparatus for use in heating, ventilationsystems, air conditioning systems and refrigeration systems; Ventilaing exhaust fans; filters for use with apparatus for water supply; Air cooling apparatus; Ceiling-mounted cooling apparatus, namely, air cooling apparatus; Ceiling-mounted heating apparatus, namely, air heating apparatus; ceiling-mounted cooling and heating apparatus, namely, air cooling and heating apparatus; He...