vent covers, not of metal; vent covers, not of metal, for HVAC ducts; non-metal vent covers; grilles, not of metal, for ventilation openings

Air diffusers, not of metal, (vents, grills) for ventilating heating and air conditioning installations; Channels of non-metallic materials for transmitting air for ventilation; Ducts, not of metal, for ventilating and air-conditioning installations; Non-metallic ducts for ventilating and air conditioning installations; Non-metallic ventilator flaps for buildings; Non-metallic ventilators (vents) for buildings

Air diffusers, not of metal, (vents, grills) for ventilating heating and air conditioning installations; Channels of non-metallic materials for transmitting air for ventilation; Ducts, not of metal, for ventilating and air-conditioning installations; Non-metallic ducts for ventilating and air conditioning installations; Non-metallic ventilator flaps for buildings