Can be used as a silencer or for pressure regulation in flexible and spiral-seam pipes. Suitable for ventilation and de-aeration. Can be flexibly adapted to the conditions by removing the plugs. Small opening provided for measuring the air flow. Small space requirement. Easy to install. Can be retrofitted. Fire and mold-resistant foam, in accordance with the requirements of emission class M1. Easy to clean with a vacuum cleaner.Article: SDE 12, Installation location: Pipe, Material: PU foam, Weight: 0.07 kg, Weight with packaging: 0.1 kg, Nominal width: 125 mm, Suitable for nominal width: 125, Outside diameter: 127 mm, Width: 120 mm, Height: 120 mm, Depth: 50 mm, Width with packaging: 120 mm, Height with packaging: 120 mm, Depth with packaging: 50 mm, Insertion loss at 63 Hz: 5 dB / 2 dB / 1 dB, Insertion loss at 125 Hz: 6 dB / 2 dB / 1.5 dB, Insertion loss at 250 Hz: 5 dB / 2.5 dB / 1.5 dB, Insertion loss at 500 Hz: 5 dB / 3 dB / 2.5 dB, Insertion loss at 1 kHz: 12 dB / 8.5 dB / 6 dB, Insertion loss at 2 kHz: 13 dB / 8 dB / 5 dB, Insertion loss at 4 kHz: 19 dB / 14 dB / 11 dB, Insertion loss at 8 kHz: 21 dB / 19 dB / 18 dB, Insertion loss Note: Data for 1, 3 and 5 openings