الوصف

Double Helical Acoustic Flexible Aluminum Foil Duct（DEC-CXIA）
Inner duct of the item is perforated duct, which is covered with tough polyester film and flbreglass wool. The outer jacket is spiral flexible aluminum-plastic composite duct. It is characteristic of well preventing sound leaking from pipe wall, higher strength good resistance to acid, alkali, wear-resistance, puncture and tear resistance. 

Specification:
1.Temperature range:      -30℃ to +140℃
2.Operating pressure:      Max.+2500 Pa
3.Opearting air velocity:    Max 30m/s
4.Bending radius:          Min 0.54*D+25mm
5.Diameter range:         52mm-508mm
6.Standard length:         10m
Sound Performance：Grade A Insertion Loss 10dB
Construction
1.Inner duct: perforated AL foil
2.Glass wool blanket: 25mm,24kg/m³
3.Barrier：non woven fabric/PET film
4.R-value: 0.65㎡k/w
5.Outer jacket: steel spiral helix between the lays