MI-FLEX Adaptor - Ø 100
At a Glance
- Crafted from 0.6mm 316 stainless steel
- Seamlessly connects rigid single wall flue systems with MI-FLEX flexible liners
- Compliant with Building Regulations Document J
- Supports appliances operating at up to 600°C
- Suitable for wood (<20% moisture), smokeless coal, gas, and oil

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 MI-FLEX Adaptor Ø 100 is expertly crafted from 0.6mm 316 stainless steel, designed to connect rigid single wall flue systems to MI-FLEX flexible flue liners of the same diameter. This highly durable adaptor is a key component in forming a complete chimney system when used with MI-FLEX 316 or 904 flexible flue liners. Compliant with Building Regulations Document J, it ensures a gas-tight seal when properly installed within a masonry chimney.
It supports appliances operating up to 600°C (T600 designation) and is suitable for wood with less than 20% moisture, smokeless coal, gas, and oil. The transition joint created by this adaptor must be securely fixed using fire cement, ceramic rope, or high-temperature sealant to ensure safety and efficiency. Regular maintenance, including annual sweeping by a competent person, is essential for optimal performance and longevity.
SKU: 20-100-MA
Technical Specifications | |
---|---|
Material | 0.6mm 316 Stainless Steel |
Design | Transitional joint between rigid single wall flue and MI-FLEX flexible liners |
Compliance | Building Regulations Document J |
Temperature Rating | Up to 600u00b0C (T600) |
Fuel Compatibility | Wood (<20% moisture), Smokeless Coal, Gas, Oil |
Approvals | HETAS / CE |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, April 8th. 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
The MI-FLEX Adaptor Ø 100 is an outstanding choice for creating a seamless connection in your chimney system. With high durability and compatibility, it's ideal for both retail and trade customers. National Flues ensures reliable delivery nationwide.
The MI-FLEX Adaptor Ø 100 is designed to create a secure and seamless connection between a rigid single wall flue system and MI-FLEX flexible flue liners, ensuring compliance with Building Regulations and optimal chimney performance.
National Flues is a trusted supplier of fireplaces and flues across the UK, catering to both retail and trade customers with competitive pricing and reliable delivery services.
