Webasto Thermoduct is constructed with a 3M “Thinsulate” inner core and a heavy duty outer cover. Supplied in 750mm length it is designed to slide directly over warm air ducting, providing exceptional thermal insulation.FeaturesTemperature Resistant up to 140CHydrophobic actually repels water, thus preventing mould and mildewHypoallergenicCan double the effective heat output from air heaters by minimizing ducting heat lossAllows long ducting runs to provide effective heat outputReduces heater running times, improving fuel and electrical power consumptionReduces external duct temperature from circle 100C to 30C