Wall Sleeve 45° Adjustable - Ø 125
At a Glance
- 45° adjustable design for flexible installation
- Dual stainless steel layers (304 outer, 316 inner; both 0.4mm thick) for enhanced durability
- Compressed rockwool insulation (200kg/m³ TWPro / 128kg/m³) for superior thermal protection
- HETAS approved and CE marked to meet safety standards
- Versatile: suitable for wood stoves, gas, oil, and low sulphur coal appliances

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 45° Adjustable - Ø 125 is designed for chimney systems used with solid fuel and gas/oil appliances, such as wood stoves, gas coal effect fires, and oil and gas boilers. Constructed with a 304 grade stainless steel outer skin and a 316 grade stainless steel inner skin, both 0.4mm thick, this wall sleeve is built for durability and efficiency. The insulation consists of compressed rockwool with a density of 200kg/m³ TWPro / 128kg/m³, ensuring excellent thermal protection.
Fully welded parts guarantee a robust build, and the product is HETAS approved and CE marked. When installing, secure the parts using a Locking Band and maintain the recommended distance from any combustible materials. This adjustable wall sleeve, pre-cut at 45°, allows easy manual extension within the wall, making installation more flexible and straightforward.
SKU: 15-125-100
Technical Specifications | |
---|---|
SKU | 15-125-100 |
Materials | 304 Stainless Steel outer / 316 Stainless Steel inner; both 0.4mm thick |
Insulation | Compressed rockwool (200kg/mu00b3 TWPro / 128kg/mu00b3) |
Approvals | HETAS / CE |
Distance To Combustibles | TWPro: 50mm; KC: 60mm |
Suitable Fuels | Wood, Oil, Gas, Low sulphur coal |
Dimensions | u00d8 125, Pre-cut 45u00b0 Adjustable Wall Sleeve |
Installation Accessory | Locking Band required |
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.
Compatible and other products that may be of interest...
National Flues Ltd Verdict
The Wall Sleeve 45° Adjustable - Ø 125 is an essential component in any flue system, ensuring safety and performance. With National Flues' unbeatable prices and reliable nationwide delivery, both retail and trade customers can trust us for their fireplace and flue needs.
The Wall Sleeve 45° Adjustable is used to protect the chimney in the wall passage and ensure safe passage of the flue system through the exterior wall.
National Flues is a leading UK supplier of fireplaces and flues, offering high-quality products to both retail and trade customers. We pride ourselves on unbeatable prices and reliable nationwide delivery.
