Zehnder ComfoFix Mounting Bracket 90mm (pack of 10) zehnder_manifold The Zehnder ComfoTube Flow 75mm The Zehnder ComfoTube Flow 75mm is a high performance semi rigid ductwork ideal for residential applications attenuation and thermal properties make it the ideal ductwork for use in small ceiling voids as well as being strong enough to be used in areas where there is a concrete pour The mounting bracket can be prefixed on the floor wall ceiling and allows the Zehnder ComfoTube ø 90mm to be clicked in place Over 50% of time can be saved on installation using ComfoFix when compared to installation using perforated metal banding without the risk of damage to the ductwork