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MI-FLEX Adaptor - Ø 150 (20-150-MAE)

Discover the excellence of the MI-FLEX Adaptor - Ø 150 by National Flues, a high-quality 316L stainless steel component engineered for seamless flue transitions. Perfect for multi-fuel heating systems, this adaptable and efficient product is a must-have for those seeking a reliable connection between rigid and flexible flue systems. The MI-FLEX Adaptor brings together performance, safety, and compliance, ensuring your chimney meets all necessary standards.
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£18.99
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At a Glance

  • Made from 0.6mm thick 316L stainless steel for top durability
  • Provides a reliable, gas-tight transition between flue systems
  • Compatible with multifuel options including wood, oil, gas, and smokeless coal
  • Withstands temperatures up to 600°C (T600 rating)
  • Designed for installation within masonry chimneys to comply with Building Regulations Document J

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Have Questions?
Phone: 01670 206999
Email: [email protected]

The MI-FLEX Adaptor - Ø 150 is a 0.6mm thick 316 stainless steel adaptor specifically designed for seamless connections between a rigid single wall flue system and the MI-FLEX flexible flue liner. This adaptor is vital for achieving a gas-tight transition, ensuring the secure and efficient operation of your heating system. It is suitable for use with multiple fuels including wood with less than 20% moisture, smokeless coal, gas, and oil, and can withstand temperatures up to 600°C (T600 designation).

To comply with Building Regulations Document J, it must be installed entirely within a masonry chimney. The bottom fixings secure the transition neatly within the existing masonry, and additional sealing materials such as fire cement, ceramic rope, or high-temperature sealant are recommended for best results. Maintenance is straightforward, requiring routine sweeping by a competent person and regular inspections to ensure safety and efficiency.

This makes it a versatile, reliable choice for maintaining clean and efficient flue systems.

SKU: 20-150-MAE

Technical Specifications
Material316L Stainless Steel
Thickness0.6mm
Nominal Diameteru00d8 150
Temperature Rating600u00b0C (T600)
Fuel CompatibilityWood (less than 20% moisture), Oil, Gas, Smokeless Coal
ApprovalsHETAS / CE
Installation RequirementMust be fully installed within a masonry chimney
• Ensure the adaptor is installed entirely within a masonry chimney as per Building Regulations Document J. • Use bottom fixings to secure the adaptor firmly, ensuring there is no visible flex at the transition point. • For enhanced sealing, it is recommended to apply additional sealing materials such as fire cement, ceramic rope, or high-temperature sealant around the joint. • Routine maintenance, including regular sweeping by a competent person and periodic inspections, is essential to maintain system efficiency and safety.

Its primary function is to connect a rigid single wall flue system to a MI-FLEX flexible flue liner, ensuring a seamless, gas-tight transition inside a masonry chimney.

The adaptor is made from 0.6mm thick 316 stainless steel, making it durable and resistant to high temperatures and corrosion.

It is compatible with wood (less than 20% moisture), smokeless coal, gas, and oil.

It can withstand temperatures up to 600°C (T600 designation).

It should be installed entirely within a masonry chimney as per Building Regulations Document J. Bottom fixings should secure the adaptor and ensure no flex is visible.

Regular sweeping and inspections are necessary, ideally by a competent person. For solid fuel applications, you should check for blockages and deposits at least twice a year.

No, chemical cleaners and mild steel tools should not be used to sweep stainless steel chimneys as they can cause damage.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, April 29th. 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 MI-FLEX Adaptor - Ø 150 buyers guide

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