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Increasing MI-FLEX Adaptor - Ø 125-Ø 175 (20-125-MRD)

Discover the superior Increasing MI-FLEX Adaptor by National Flues – a robust and reliable stainless steel solution designed to bridge the gap between ridged single wall flue systems and MI-FLEX flexible liners. Engineered for high performance and safe operation at temperatures up to 600°C, this adaptor is the ideal choice for modern chimney installations, ensuring compliance, durability, and efficiency.
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£66.49
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At a Glance

  • 0.6mm 316 stainless steel construction
  • Increases flue diameter from Ø125mm to Ø175mm (50mm increase)
  • Durable, high-temperature resistance up to 600°C (T600 designation)
  • Compatible with wood (<20% moisture), oil, gas, and smokeless coal
  • BSEN 1856-2 T600, HETAS & CE compliant; Building Regulations Document J approved

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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 Increasing MI-FLEX Adaptor - Ø125mm to Ø175mm from National Flues is a must-have for any chimney setup. This 0.6mm 316 stainless steel adaptor serves as a transitional joint that effortlessly connects a ridged single wall flue system to MI-FLEX flexible flue liners. Designed to boost performance and improve system integrity, this adaptor increases the diameter by 50mm, accommodating a variety of fuel types including wood (with moisture <20%), smokeless coal, gas, and oil.

Engineered to withstand temperatures up to 600°C (T600 designation), it ensures a gas-tight seal with the use of fire cement, ceramic rope, or high-temperature sealant. Building Regulations Document J compliance guarantees safe and effective installation within a masonry chimney. Regular maintenance, such as sweeping and inspections done by a competent person, ensure longevity and optimal performance.

SKU: 20-125-MRD

Technical Specifications
Material316L Stainless Steel
Thickness0.6mm
Diameter Conversionu00d8125mm to u00d8175mm
Temperature RatingUp to 600u00b0C (T600)
Fuel CompatibilityWood (<20% moisture), Oil, Gas, Smokeless Coal
CertificationsBSEN 1856-2 T600, HETAS, CE
SystemMI-FLEX Accessories MF20
ComplianceBuilding Regulations Document J
Install the Increasing MI-FLEX Adaptor within the confines of an existing masonry chimney. Ensure that no flex element is visible by fitting the adaptor securely inside the chimney structure. Use fire cement, ceramic rope, or a high-temperature sealant to achieve a gas-tight seal, preventing any leakage of exhaust gases. For safety, always adhere to the manufacturer’s guidelines and consult a certified installer if unsure. Regular maintenance, including routine sweeping by a HETAS registered professional, is essential to maintain peak performance and system safety.

The adaptor is made from 0.6mm 316 stainless steel, providing high durability and resistance to corrosion under extreme temperatures.

Yes, the adaptor meets Building Regulations Document J requirements, ensuring it can be safely enclosed within a masonry chimney.

The adaptor is suitable for use with wood (with less than 20% moisture content), smokeless coal, gas, and oil.

The adaptor should be installed within the confines of an existing masonry chimney, ensuring no flex is visible. Use fire cement, ceramic rope, or high-temperature sealant to achieve a gas-tight seal.

Regular sweeping and maintenance are essential. It is recommended to sweep chimneys serving solid fuel appliances twice a year, and at least once annually for other systems.

No, chemical cleaners and mild steel tools should not be used. Use appropriate methods and tools to avoid damaging the stainless steel components.

You can find a list of HETAS registered sweeps at www.hetas.co.uk, ensuring qualified professionals conduct the chimney sweeping.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Wednesday, April 30th. 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 on a retail basis. Give us a call if you find it cheaper and want to buy from us.

Read our review in our Increasing MI-FLEX Adaptor - Ø 125-Ø 175 buyers guide

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