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Screw-FIX Joiner - Ø 150 (25-150-J)

The Screw-FIX Joiner - Ø 150 from National Flues is a premium chimney accessory engineered for MI-FLEX systems. This high-quality, stainless steel joiner not only ensures a secure fit for multi-fuel flexible flue liners but also complies fully with UK building standards. Ideal for wood, oil, gas, and smokeless coal applications, this joiner is an essential component to maintain a safe and efficient chimney system. Enhance your fireplace setup with National Flues and experience the perfect blend Read more...
Great value at £60.99
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At a Glance

    Designed specifically for use with MI-FLEX 316 and 904 multi-fuel flexible flue liners
    Withstands temperatures up to 600°C (T600 rating)
    Constructed from durable 316L stainless steel with a natural finish
    Fully compliant with UK Building Regulations Document J and CE/HETAS approved
    Provides a secure, seamless connection between flue liner sections

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]

The Screw-FIX Joiner Ø 150 is a top-tier accessory meticulously designed for use with MI-FLEX 316 and 904 multi-fuel flexible flue liners. Perfectly constructed to form a full-system chimney when combined with other MI-FLEX components, this joiner ensures seamless connection of two flue liner segments. Adhering strictly to Building Regulations Document J, it mandates that flexible flue liners be fully enclosed within a masonry chimney—non-masonry enclosures like timber or plasterboard are not permissible.

Capable of withstanding temperatures up to 600°C (T600 designation), the Screw-FIX Joiner is compatible with wood (<20% moisture), smokeless coal, gas, and oil. Maintenance is straightforward but crucial: sweep regularly with non-chemical cleaners and avoid mild steel tools to maintain the integrity of your stainless steel chimney system. Professional sweeping is recommended at least twice a year, especially for solid fuel applications, to ensure optimal performance and safety.

SKU: 25-150-J

Technical Specifications
SKU25-150-J
Joiner Sizeu00d8 150
Material316L Stainless Steel
Temperature RatingUp to 600u00b0C (T600)
CompatibilityMI-FLEX 316 and 904 multi-fuel flexible flue liners
Fuel TypesWood (<20% moisture), Oil, Gas, Smokeless coal
ApprovalsCE / HETAS
Regulatory ComplianceBuilding Regulations Document J
For a successful installation, ensure that the Screw-FIX Joiner is used with a completely enclosed masonry chimney, as non-masonry enclosures (such as timber or plasterboard) are not permissible by Building Regulations Document J. Install the joiner by aligning the flue liner sections carefully and securing them with the provided fixings. Regular maintenance is crucial; sweep your chimney system at least annually (twice a year for solid fuel applications) using non-chemical cleaners. Do not use mild steel tools that could damage the stainless steel surface. If in doubt, consult a professional certified by HETAS for solid fuel systems.

Yes, the Screw-FIX Joiner Ø 150 is compatible with both MI-FLEX 316 and 904 multi-fuel flexible flue liners.

Absolutely, it complies with Building Regulations Document J, ensuring safe and legal installation.

It is suitable for wood (<20% moisture), smokeless coal, gas, and oil.

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

No, it must be installed in a completely enclosed masonry chimney as per regulation.

Chimney systems should be cleaned at least once a year, with solid fuel systems ideally cleaned twice a year.

For solid fuel applications, you can find HETAS-registered sweeps at www.hetas.co.uk.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Thursday, May 22nd. Delivery times of products not in our warehouses depend on product availability and shipping. If you need a definitive delivery time give us a call. If you need faster stove or fireplace delivery please also give us a call. We can sometimes 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.

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