Silencer for noise reduction on the intake side of roof fans. With sound attenuation splitters made of abrasion-resistant and non-combustible mineral fibre boards. With shortened baffle.Article: SDVI 35, material: sheet steel, galvanised, colour: silver, weight: 37 kg, weight with packaging: 37 kg, width: 490 mm, height: 750 mm, depth: 490 mm, width with packaging: 490 mm, height with packaging: 750 mm, depth with packaging: 490 mm, insertion loss at 63 Hz: 3 dB, insertion loss at 125 Hz: 5 dB, insertion loss at 250 Hz: 9 dB, insertion loss at 500 Hz: 11 dB, insertion loss at 1 kHz: 19 dB, insertion loss at 2 kHz: 20 dB, insertion loss at 4 kHz: 18 dB, insertion loss at 8 kHz: 14 dB.