PPG intake silencer RSD 8 for ventilation systems

PPG intake silencer RSD 8 for ventilation systems.
With sound insulation packing made of resin-bonded glass fibers. Non-combustible according to DIN 4102 class A1. Insertion loss measured according to DIN 45646, 25mm sound insulation packing.
Nominal connection diameter 80mm. Aluminum. Outer diameter 190mm, length overall 1120mm, nominal diameter 80mm.