Inside - perforated aluminum, outside covered with aluminum / polyester layer.
The space between the inner and outer channels is filled with 25 mm of sound-absorbing material (glass wool 16 kg/m³)
Galvanized metal couplings on both ends for direct attachment to duct or equipment.
Type of connectors: (according to EN1506): exterior – interior (type 2)
Operating temperature -30 ⁰C +250 ⁰C
Working pressure: +2000 Pa
Stretches 0.6-1.2m