I5 Thermal insulation (polyethylene), 5 mm thick, on the outside of the plenum box. I9 Sound and thermal insulation (from -40 °C to 105 °C), 9 mm thick, on the outside of the plenum box (synthetic rubber based material).
I5 toplotna izolacija (polietilen) debeline 5 mm na zunanji strani komore I9 zvočna in toplotna izolacija (od -40 °C do 105 °C) debeline 9 mm na zunanji strani komore (material na bazi sintetičnega kavčuka)