Increasing MI-FLEX Adaptor - Ø 150-Ø 200
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

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 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 | |
---|---|
Material | 316L Stainless Steel (0.6mm thickness) |
Dimensions | Increases flue diameter from u00d8 150 mm to u00d8 200 mm |
Temperature Rating | 600u00b0C (T600) |
Compatible Fuels | Wood (<20% moisture), Oil, Gas, Smokeless Coal |
Certifications | HETAS, CE, BSEN 1856-2 |
System Compatibility | Rigid Single Wall & MI-FLEX Flexible Flue Liners |
Installation Requirement | Fully enclosed in a masonry chimney with bottom fixings and gas-tight sealing using high-temperature sealant options |
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
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.
