... duct PU air duct panel suitable material for making air conditioning ducts,wildly used in market, supermarket, guesthouse, hotel, ... light ,smoke-free ,harmless ,no dripping , widely temperature used (-196~+200),have aquired National Fireproofing Materials Quality Supervation ... conductivity 0.035W/m.k. It’s widely used for ventilation systems of central air conditioning units in hotels, apartments ...