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Wall Sleeve - Ø 125

National Flues brings you the Wall Sleeve - Ø 125mm, a premium accessory designed to protect your chimney flue system as it passes through exterior walls. This robust wall sleeve is ideal for installations involving wood burning stoves, oil boilers, gas heaters and low sulphur coal systems, ensuring... More...
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At a Glance

  • Durable 304/316 stainless steel construction
  • Suitable for wood, oil, gas, and low sulphur coal appliances
  • Easy to install with tapering option for 45° wall passages
  • Fully welded design for robust protection
  • HETAS Approved and CE marked
Now only £28.49
Including VAT Buy with confidence. If you find this cheaper within 48 hours of checkout, we'll refund the difference.

 

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Please Note: All dimensions refer to the internal diameter of flues. If unsure, please call 01670 206999 to ensure you choose the correct products.

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At National Flues, we continuously monitor competitor prices. This ensures that we consistently offer you the best deals on all our products. Here’s how we keep your costs low:

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Have Questions?
Phone: 01670 206999
Email: [email protected]

The Wall Sleeve - Ø 125mm is designed to protect your chimney system when passing through an exterior wall. Primarily used with solid fuel and gas/oil appliances such as wood stoves, gas-coal effect fires, and oil and gas boilers, this sleeve ensures durability and safety. Constructed with an outer skin of 304 grade stainless steel and an inner skin of 316 grade stainless steel, both at 0.4mm thick, it offers robust protection.

The insulation is made from compressed Rockwool, offering densities of 200kg/m3 TWPro and 128Kg/m3. All parts are fully welded, providing a seamless and sturdy finish. The distance to combustibles is 50mm for TWPro and 60mm on KC.

TWPro is HETAS Approved and CE marked, ensuring compliance with industry standards. Installation is straightforward, and the sleeve can be tapered for a flush fit when passing through walls at a 45-degree angle, easily cut using a grinder or hacksaw.

SKU: 15-125-098

Technical Specifications
SKU15-125-098
Dimensionsu00d8 125mm
Outer Material304 Stainless Steel (0.4mm thick)
Inner Material316 Stainless Steel (0.4mm thick)
InsulationCompressed Rockwool (200kg/m3 TWPro / 128kg/m3 KC)
Applicable ForWood, Oil, Gas, Low sulphur coal
CertificationsHETAS Approved, CE Marked
Distance To CombustiblesTWPro 50mm, KC 60mm
InstallationTaper-cuttable for 45u00b0 wall passage
Installation is straightforward: Start by positioning the sleeve in accordance with manufacturer instructions. Ensure that when passing through an exterior wall, the gap between the flue pipe and the wall is completely filled with properly compressed Rockwool insulation. For walls that meet at a 45-degree angle, use a grinder or hacksaw to taper the sleeve, securing a flush fit. Always maintain the minimum clearance distances – 50mm for TWPro systems and 60mm for KC systems – to ensure safety around combustibles. Check that all components are fully welded and aligned before completing the installation. If in doubt, refer to the detailed installation guide or consult a qualified professional.

It is suitable for solid fuel and gas/oil appliances, including wood stoves, gas-coal effect fires, and oil and gas boilers.

The Wall Sleeve features an outer skin made from 304 grade stainless steel and an inner skin from 316 grade stainless steel, both 0.4mm thick.

The insulation is made from compressed Rockwool, with densities of 200kg/m3 TWPro and 128Kg/m3.

Installation involves securing TWPro Twin Wall Insulated Chimney parts with a Locking Band and ensuring the required distance from combustibles. The sleeve can be cut to fit using a grinder or hacksaw if passing through walls at a 45-degree angle.

Yes, TWPro is HETAS Approved and CE marked, complying with industry standards.

The distance to combustibles is 50mm for TWPro and 60mm for KC.

Yes, if the flue system goes through the wall at a 45-degree angle, the sleeve needs to be taper-cut to fit flush in the wall.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Thursday, April 3rd. If you need faster stove or fireplace delivery please give us a call. We can often reduce longer lead times if we pay the carrier £25 for express delivery. Visit our Shipping Information page for more information.

Warranty & Returns +

All our products come with warranties. Mi-Flex offers a lifetime guarantee. Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.

Price Match Guarantee +

We will match any price like for like. If you find it cheaper within 48 hours, we'll refund the difference.

Read our buyers guide for this Wall Sleeve - Ø 125

National Flues Ltd Verdict

The Wall Sleeve - Ø 125mm is an essential component for any flue system, ensuring safe and efficient passage through walls. At National Flues, we are rarely beaten on price and offer reliable delivery nationwide to both retail and trade customers.

The Wall Sleeve - Ø 125mm protects the chimney flue system as it passes through an exterior wall, ensuring safe installation.

National Flues is a leading supplier of fireplaces and flues across the UK, offering competitive prices and reliable delivery to both retail and trade customers. We pride ourselves on exceptional service and quality products.

 

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Invest in safety and efficiency – secure your Wall Sleeve today!

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