Thermobreak® Ductboard is a dual purpose physically cross-linked polyolefin foam based duct liner that demonstrates outstanding thermal and acoustic properties. It is fibre-free, meets international fire and smoke standards and has extremely low water absorption thus preventing mould growth and odours commonly associated with fibrous based duct linings. Thermobreak® Ductboard is manufactured in a range of thicknesses complying with NCC Thermal R values.