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Increasing MI-FLEX Adaptor - Ø 150-Ø 200

National Flues presents the Increasing MI-FLEX Adaptor, a high-quality, 316L stainless steel solution designed to ensure a secure and flawless connection between rigid single wall flue systems and MI-FLEX flexible liners. Engineered for seamless transitions from Ø 150 mm to Ø 200 mm, this adaptor is... More...
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At a Glance

  • Made from premium 316L stainless steel (0.6mm) for enduring performance
  • Increases flue size from Ø 150 mm to Ø 200 mm for a seamless transition
  • Suitable for multi-fuel systems including wood (with less than 20% moisture), gas, oil and smokeless coal
  • Withstands temperatures up to 600°C (T600 rating) ensuring high heat tolerance
  • Fully compliant with UK Building Regulations and certified approvals (HETAS / CE, BSEN 1856-2)
  • Designed for integration with rigid single wall flue systems and MI-FLEX flexible liners
  • Installation optimised for use within masonry chimneys to secure safe operation
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Have Questions?
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The Increasing MI-FLEX Adaptor Ø 150-Ø 200 is an essential accessory for your flue installation needs. Crafted from durable 0.6mm 316 stainless steel, this adaptor ensures a seamless connection between your rigid single wall flue system and MI-FLEX 316 or 904 flexible flue liners. This specific adaptor increases the flue size by 50mm, transitioning from Ø 150mm to Ø 200mm smoothly.Designed for multi-fuel flexibility, the MI-FLEX Adaptor can withstand temperatures up to 600°C (T600 designation) and is suitable for use with wood (<20% moisture), smokeless coal, gas, and oil appliances.

Adhering to UK Building Regulations Document J, it is vital that these adaptors are installed completely within a masonry chimney to ensure safety and efficiency.Bottom fixings must be used to secure the connection, with provisions for a gas-tight seal via fire cement, ceramic rope, or high-temperature sealant. This will ensure no flexible liner is exposed externally. Maintenance is straightforward but essential; chimneys must be swept by a competent person, preferably a HETAS registered sweep, at least annually or more frequently for solid fuel appliances.

Proper maintenance keeps your system performing efficiently and safely year-round.

SKU: 20-150-MRD

Technical Specifications
Material316L Stainless Steel (0.6mm thickness)
DimensionsIncreases flue diameter from u00d8 150 mm to u00d8 200 mm
Temperature Rating600u00b0C (T600)
Compatible FuelsWood (<20% moisture), Oil, Gas, Smokeless Coal
CertificationsHETAS, CE, BSEN 1856-2
System CompatibilityRigid Single Wall & MI-FLEX Flexible Flue Liners
Installation RequirementFully enclosed in a masonry chimney with bottom fixings and gas-tight sealing using high-temperature sealant options
For optimal performance and adherence to UK Building Regulations, the Increasing MI-FLEX Adaptor must be installed entirely within a masonry chimney. Begin by ensuring that the adaptor is correctly positioned to facilitate a smooth transition between the rigid single wall flue system and the flexible MI-FLEX liner. Bottom fixings are essential to secure the connection. Use a gas-tight sealing method – options include fire cement, ceramic rope, or high-temperature sealant – to ensure no part of the flexible liner is exposed externally. It is strongly recommended that installation is carried out by a qualified professional familiar with masonry chimney systems and the specific requirements of flue installations. Regular maintenance, including annual inspections and cleaning by a HETAS registered professional, is crucial in maintaining the system’s safety and efficiency.

The Increasing MI-FLEX Adaptor is suitable for use with wood (with less than 20% moisture), smokeless coal, gas, and oil.

It can withstand temperatures up to 600°C (T600 designation), making it suitable for a variety of fuel types.

The adaptor should be installed entirely within a masonry chimney, with provisions for a gas-tight seal using fire cement, ceramic rope, or high-temperature sealant.

Regular chimney sweeping by a competent person, such as a HETAS registered sweep, at least annually. Twice a year is recommended for solid fuel appliances.

No, UK Building Regulations require that the flexible flue liner and its components be enclosed within a masonry chimney.

Installation should be performed by a professional to ensure it meets all safety and regulatory standards.

You can find a list of HETAS registered sweeps for solid fuel applications at www.hetas.co.uk.
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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Read our buyers guide for this Increasing MI-FLEX Adaptor - Ø 150-Ø 200

National Flues Ltd Verdict

At National Flues, we provide this essential Increasing MI-FLEX Adaptor with utmost confidence, ensuring you get the best quality and a perfect fit for your chimney system. Reliable nationwide delivery for both retail and trade customers.

The Increasing MI-FLEX Adaptor is used to create a transitional connection from a rigid single wall flue system to a flexible MI-FLEX flue liner, ensuring a secure and gas-tight fit.

National Flues is a leading supplier of high-quality flue and chimney products, providing reliable service and delivery to retail and trade customers nationwide. We pride ourselves on unbeatable prices and a vast product range to suit all your flue installation needs.

 

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Ensure your chimney system performs safely and efficiently – secure your adaptor today!

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