There is quite a range of Ductliner type insulations, which one should I use?
All Bradford Ductliners will provide good insulation for thermal efficiency and condensation control. The question of which one is related to: • Sound absorption characteristics: Generally speaking all Ductliners perform excellently in the mid to high frequency range. In the low frequency range absorption increases with thickness and/or density. The final choice will be influenced by the amount of absorption required. • Compression resistance/smoothness of internal surface: As density of insulation increases so does resistance to “quilting” due to pinning. This has significance in high velocity ducts, where a smooth flat surface is desirable to minimise friction losses, turbulence and air noise. Most commonly Tel-Glasswool Supertel is used although for higher compression resistance Glasswool Ultratel or Rockwool Ductliner are recommended.
