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Vortex Acoustic Ducting - 10 Metre Length Size:12" L-tryptophan is a precursor toPlease note: This item is purchase to order. Vortex Acoustic Ducting 10 Metre 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 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