| Inside diameter | 76-254mm |
| Anechoic performance | 10～20 A(dB)/m |
| Working pressure limit | 2500Pa |
| Perforation rate | >15% |
| Production length | 10m |
| sound-absorbing cotton | 25~50mm |
| inlay | Needle-punched nonwoven fabrics |
| Construction | Jacket-PVC foil single tube |
| Application | Air conditioning systems, fresh air systems, VAV systems, all-air systems, etc, Return air duct end muffling |
| Characteristics | Wide noise reduction frequency range, inner tub e working temperature -15to+60℃ |
