Size Name:4 " / 100 mm USE For attenuation of noise produced by a ventilation system and spreaded along ventilation ductworks. Used jointly with sound-insulated fans in premises with high requirements to noise level produced by ventilation equipment. Compatible with Ø 100 mm up to 315 mm round air ducts. DESIGN Consists of outer and inner flexible spiral seam air ducts made of aluminium alloy and filled with non-flammable sound-absorbing material. Internal surface is perforated and covered with protection coating to prevent fiber blowing-out. A great variety of standard ranges with several length options. MOUNTING Fixing to round ducts with clamps. Any mounting position. For better sound absorption install the silencers in series. Fixing on both ends and in
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