Acoustical and thermal insulating liners for air ducts; rubber, gutta-percha, gum, asbestos, mica and goods made from these materials and not included in other classes; plastics in extruded form for use in manufacture; packing, stopping and insulating materials; flexible pipes, not of metal

Fibreglass internal duct-liner for use in air conditioning ducts for acoustical and thermal insulation, and all other goods included in this class