Increasing MI-FLEX Adaptor - Ø 100-Ø 125 (20-100-MR)
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Fast deliveryFriday, November 14th*
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Best PriceCall us to beat any price you found online.
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At a Glance
- Seamless transition from a single-wall rigid flue to a flexible MI-FLEX liner
- Constructed from durable 316L stainless steel for long-lasting performance
- Supports a range of fuels including wood (<20% moisture), oil, gas, and smokeless coal
- Withstands high operating temperatures up to 600°C (T600 designation)
- HETAS and CE approved to meet Building Regulations Document J
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: sales@nationalflues.com
- Details
- Specs
- Install/Packs
- FAQs
The Increasing MI-FLEX Adaptor Ø 100 to Ø 125 is a must-have accessory for your MI-FLEX 316 and 904 flexible flue liners. This robust 0.6mm 316 stainless steel adaptor is meticulously crafted to serve as a transitional joint, increasing the diameter from a single-wall connecting flue system to a flexible liner by up to 25mm. Ideal for use with appliances operating at temperatures up to 600°C (T600 designation), it supports wood with less than 20% moisture, smokeless coal, gas, and oil.
Complying with Building Regulations Document J, this adaptor must be used within a fully enclosed masonry chimney. Ensuring a secure, gas-tight seal is critical – fire cement, ceramic rope, tape, or high-temperature sealant is recommended for optimal connection integrity. Regular maintenance is essential, with HETAS registered sweeps recommended for solid fuel applications.
Sweep your chimney at least twice a year for optimal performance and longevity.
SKU: 20-100-MR
Delivery Information* +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, November 14th. This is based on current lead times. Bear in mind that it is a busy time of year. If you need a product delivered by a specific time in the next 7 days, then please give us a call on 01670 206 999. Visit our Shipping Information page for more information.
About National Flues Ltd +
We began over 30 years ago as a fireplace shop in the North East. We now supply hundreds of trade professionals and thousands of retail customers, all across the UK, every month. We are still a family owned business, lead by the MD Neil, and always try our best to deliver the best possible experience. We also price match, so give us a call if you find this cheaper and want to buy from us. Visit our about us page to read a bit more.
This is us — real advice over the phone, or at the counter, and real stock in our warehouse.
| Technical Specifications | |
|---|---|
| SKU | 20-100-MR |
| Material | 316L Stainless Steel |
| Adaptor Diameter | Ø 100 to Ø 125 mm |
| Wall Thickness | 0.6 mm |
| Operating Temperature | Up to 600°C |
| Fuel Compatibility | Wood (<20% moisture), Oil, Gas, Smokeless Coal |
| Standards | HETAS / CE Approved |
| System | MI-FLEX Accessories MF20 |