Original price was: £315.34.£252.27Current price is: £252.27. £302.72 incl. VAT
On Backorder
As Zehnder has lauched a new, much more efficient version of their ComfoTube, we are happy to offer their high-quality ducting system.
Semi-rigid ducting, 90mm outer dia./ 77mm inner dia., 50m coil, white.
If the space is allowing it, we prefer the 90mm semi-rigid ducting system over the 75mm ducting system as it allows for slower air velocity, which reduces energy cost and noise and/or fewer ducts are needed for an installation.
Please note, this item has 3-4 working days delivery time. If it is needed more urgently, additional delivery charges apply.
For most items our delivery charge is £5.94+VAT. Orders to over £250.00+VAT are free of delivery charges. Different charges apply for for Northern Ireland (£13.13+VAT), the isles (£15.02+VAT) and Scottish Highlands (£17.68+VAT) with free delivery of orders over £450.00+VAT.
We ususally deliver stocked items within 2-3 days. For urgent orders, please call us on 01383 221 255 to check stock levels.
We can only process orders to the UK (with UK/ EU payment cards). We never ask for your card details, but we re-direct to Take Payments, our secure payment gateway.
| Size | 91 mm outer diameter; 77 mm inner diameter |
| Material | PE, inside with anti-static and anti-bacterial additives |
| Air volume flow rate | max. 45 m3/h |
| Bend radius | ≥ 150 mm |
| Permissible temperatures | Perm. operating temperature from -25 °C to 60 °C Installation temperature no less than -5 °C |
| Ring stiffness | ≥ 8 kN/m2 acc. to EN ISO 9969 |
| Coil | Length: 50 m; Size: 1,180 x 410 mm; Weight: 20 kg |
Recommended maximum length of ducting in relation to the air flow rates per room terminal:
| m3/h | l/s | 1x O90 duct Single plenum |
2x O90 ducts Double plenum |
| 20 | 5.6 | max. 28 m | |
| 25 | 6.9 | max. 20 m | |
| 30 | 8.3 | max. 14 m | max. 40 m |
| 35 | 9.7 | max. 10 m | max. 35 m |
| 40 | 11.1 | max. 7 m | max. 28 m |
| 45 | 12.5 | max. 24 m | |
| 50 | 13.9 | max. 20 m | |
| 55 | 15.3 | max. 17 m | |
| 60 | 16.7 | max. 14 m | |
Please note, we have tried and tested different semi-rigid products and have noticed a considerable difference in quality and performance. We consider this product as superior to many others (including the Zehnder ComfoTube 90mm). Most products failed our requirements for durability and efficiency due to either brittle inner lining, creasing when bent or a rough and too corrugated inner surface. Our semi-rigid duct, however, has a much smoother inner lining without being corrugated and therefore has a better air flow performance.
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