Kanal Schalldämpfer Geräuschreduzierung Akustik Lüftung Ventilator Massiv Schalldämpfer
High Quality Ducting Fan Solid Silencers. Huge 50mm silencer wall for a high level of attenuation. Basically, the more air you try and move through smaller ducts, the faster the air travels and the more noise it makes.