- the silencer shell is made of Al flexible hose - the inner part is made of perforated Al hose - it allows to achieve considerable noise attenuation - it can be installed very easily - it is possible to connect several silencers together to achieve extremely good noise attenuation - good results are achieved in conjunction with MIXVENT-TD - the pressure drop of the silencer is considered to be 4 times the pressure drop of a smooth duct - larger diameters must be discussed