275 Galvanized Spiral Duct With 15mm Insulation Layer, Inner‑outer Double‑layer Galvanized Ventilation Pipe

275 Galvanised Spiral Duct with 15mm Insulation — Double-Layer Insulated Ventilation Pipe

A double-layer galvanised spiral duct with a 15 mm insulation layer between the inner and outer skins. The double-wall construction gives the round duct a clean factory-finished insulated appearance while improving both thermal and acoustic performance. The inner and outer layers are 275 galvanised steel sheet with insulation foam between them.

Key Features

• Factory double-wall construction — inner and outer 275 galvanised steel skins
• 15 mm insulation layer — thermal and acoustic benefit in one product
• Clean insulated appearance — no site lagging or wrap required
• Spiral seam — strong, round, aerodynamically efficient duct
• Custom lengths — made to suit the project

Technical Specifications

Typical Applications

• Exposed supply and exhaust ductwork where appearance matters
• Runs requiring thermal and acoustic performance
• Commercial and residential ventilation systems

System Matching

Matches our galvanised stamped elbow segments and insulated galvanised spiral duct. For larger systems see the duct silencer.

FAQ

Q: How thick is the insulation?
A: 15 mm, as listed in the specification table below.

Q: Are elbow segments available?
A: Yes, see our matching galvanised stamped elbow segments.

Q: Can lengths be customised?
A: Yes, duct lengths can be made to suit the project.