Vortex Acoustic Ducting - 5 Metre LengthVortex Acoustic Ducting 5 Metres Length Vortex Acoustic Ducting very effectively helps reduce the noise produced by your extraction system. If you need to keep things quiet, acoustic ducting will help! How Vortex Acoustic Ducting Works Vortex Acoustic Ducting ducting consists of an inner layer and an outer layer of flexi ducting separated by a layer of insulating fibreglass in between. As air passes down normal flexi ducting, the sound of the fan and