Apparatus for exhausting mists (ventilation); Apparatus for extracting mists (ventilation); Air delivery apparatus for ventilating buildings; Installations for air extraction

Rigid pipes of plastics (other than parts of sanitary installations; Channels of non-metallic materials for transmitting air for ventilation; Non-metallic air ducts for buildings; Ducts, not of metal, for ventilating and air-conditioning installations; Non-metallic ducts for ventilating and air conditioning installations; Non-metallic venting ducts; Flexible partitions of non-metallic materials; Building products made by the extrusion of synthetic plastics; Building products made by the moulding of synthetic plastics