... duct,air duct,A/C vent duct, ducting pipe) Fibre Glass Insulated Material (insulated duct,air duct,A/C vent duct ... insulated flexible air ducts are specifically produced for low and medium pressure heating, cooling, ventilation, exhaust and air conditioning systems. ... strengthened with high tension hard steel spring wire, surrounded with glass wool insulation (thickness 25/50 mm, density 16 kg/m ...