•SLEEVEAFS air duct insulation materials are ready to use insulation elements which are specifically produced for circular and/or oval air duct insulation. •Airtight SLEEVEAFS is produced from glass wool and covered with jacket. The outer jacket protects the insulating material and also serves as a vapour barrier. •SLEEVEAFS is fast and easy to install. •The fire resistance of SLEEVEAFS has been tested and certified by various international bodies.