Silencer for noise reduction on the intake side of roof fans. With sound attenuation baffles made of abrasion-resistant and non-combustible mineral fibre panels: SDI 80-90, Material: galvanised sheet steel, Colour: silver, Weight: 89 kg, Weight with packaging: 89 kg, Nominal width in mm: 800-900, Width: 1080 mm, Height: 1000 mm, Depth: 1080 mm, Width with packaging: 1080 mm, Height with packaging: 1000 mm, Depth with packaging: 1080 mm, Insertion loss at 63 Hz: 3 dB, insertion loss at 125 Hz: 4 dB, insertion loss at 250 Hz: 5 dB, insertion loss at 500 Hz: 8 dB, insertion loss at 1 kHz: 14 dB, insertion loss at 2 kHz: 9 dB, insertion loss at 4 kHz: 7 dB, insertion loss at 8 kHz: 3 dB.