Auxiliary ventilation ducting, lay‑flat and spiral, made from PVC-coated polyester technical fabric. Choose the geometry that fits your drift cross-section and ventilation setup.
18″ to 60″
An auxiliary ventilation solution designed to carry air through drifts, ramps, tunnels and working faces in underground mining. It is built from PVC-coated polyester technical fabric and combines flexibility, mechanical strength and easy installation.
Depending on the application, it can include:
24″ to 60″ · custom
Designed to move air where headroom is limited. Its oval cross-section reduces the height the duct takes up and makes better use of the drift.
18″ to 60″
Reinforced with a steel wire helix that keeps the cross-section open and provides structural stability in operation. Used in underground mines and tunnels where air must be moved with a stable geometry.
Unlike lay-flat ducting, which can collapse when it is not pressurized, spiral ducting includes a reinforcement that helps it keep its shape.
Nominal sizes
Nominal diameter and cross-section dimensions in inches (in). Select a diameter to see its equivalents.
| Round | Spiral | Oval | ||
|---|---|---|---|---|
| Ø in | Ø in | Ø in | A | B |
| 18 | 18 | – | – | – |
| 24 | 24 | 24 | 18 | 33 |
| 30 | 30 | 30 | 22 | 41 |
| 32 | 32 | 32 | 24 | 43 |
| 36 | 36 | 36 | 27 | 48 |
| 42 | 42 | 42 | 31 | 56 |
| 48 | 48 | 48 | 36 | 63 |
| 54 | 54 | 54 | 40 | 71 |
| 60 | 60 | 60 | 45 | 78 |
Oval ducting can be made to dimensions tailored to each project. Nominal sizes; manufacturing tolerances per data sheet.
Common questions
Lay-flat ducting is a flexible duct that flattens when there is no air pressure, which makes it light and easy to transport. Spiral ducting has a steel wire helix that keeps the cross-section open even without pressure and gives it structural stability in operation.
Round and spiral ducts range from 18″ to 60″ in diameter. Oval ducting is made in 24″ to 60″ equivalents, or to custom dimensions for your project. See the size chart.
When headroom in the drift is limited. The oval cross-section reduces the height the duct takes up above equipment and helps the ventilation line coexist with mobile equipment on ramps and crosscuts.
PVC-coated RipStop polyester technical fabric, 600 g/m², with MSHA-approved, flame-retardant and anti-static options. See the fabric data sheet.
Australian-style, snap and steel ring couplings. If you are not sure which one suits your line, we will advise you when you request a quote. More on couplings.
Yes. Oval ducting can be made to dimensions tailored to each project, and fittings outside the catalog are built to the diameters and geometry of your system.
Ideally the duct type, diameter, approximate total length, coupling type and whether you need MSHA-approved fabric. If you don’t have all of it, send what you have through the quote form and a specialist will contact you.
Send us the size, total length and coupling type. We will reply with a technical and commercial proposal.