P 3

Metal section bars to connect pre-insulated air ducts; sandwich panels of metal for air conditioning ducts

Sandwich panelled ventilation and air force ducts as part of air conditioning apparatus; ducts as part of air ventilation apparatus

Semi-processed plastic in the form of sheets, tubes, bars

Panels, not of metal, for further manufacture, used in building construction; sandwich paneled ventilation ducts, not of metal, for air conditioning apparatus; non-metal sandwich panels for air conditioning ducts; non-metal air conditioning ducts; non-metal ducts not for electrical circuitry; non-metal heating ducts; non-metal ventilating ducts