Wall Sleeve - Ø 125
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

Please Note: All dimensions refer to the internal diameter of flues. If unsure, please call 01670 206999 to ensure you choose the correct products.
We Won't Be Beaten On Price
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:
- Daily Price Matching: Our team adjusts prices to ensure we stay competitive.
- Bulk Purchasing Power: We sell a lot, so we can negotiate better rates with suppliers, passing the savings directly to you.
- Operational Efficiency: We have streamlined processes to reduce overhead.
Price Match Guarantee: If you find the same product cheaper within 48 hours, we’ll match it and refund the difference.
Free Delivery Over £100: Orders over £100 are free delivery (call us if delivery is required outside the mainland UK).
“I saved 20% on my purchase compared to other retailers. Exceptional service!” – Jane D.
Have Questions?
Phone: 01670 206999
Email: [email protected]
- Info
- Specs
- Install
- FAQs
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 | |
---|---|
SKU | 15-125-098 |
Dimensions | u00d8 125mm |
Outer Material | 304 Stainless Steel (0.4mm thick) |
Inner Material | 316 Stainless Steel (0.4mm thick) |
Insulation | Compressed Rockwool (200kg/m3 TWPro / 128kg/m3 KC) |
Applicable For | Wood, Oil, Gas, Low sulphur coal |
Certifications | HETAS Approved, CE Marked |
Distance To Combustibles | TWPro 50mm, KC 60mm |
Installation | Taper-cuttable for 45u00b0 wall passage |
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.
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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.
