Screw-FIX Increaser - Ø 100-125mm (25-100-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
- Manufactured from premium 0.6mm 316L stainless steel
- Withstands temperatures up to 600°C (T600 designation)
- Ensures a secure, gas‐tight connection between rigid single wall and MI-FLEX flexible flue liners
- Complies with BSEN 1856-2 and Building Regulations Document J
- Suitable for use with wood (<20% moisture), oil, gas, and smokeless coal
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 Screw-FIX Increaser Ø 100-125mm is a premium accessory designed to ensure a seamless and secure connection between a rigid single wall connecting flue system and MI-FLEX flexible flue liners. Made from 0.6mm 316 stainless steel, this increaser offers superior durability and resistance to high temperatures, supporting appliances up to 600°C (T600 designation). In compliance with Building Regulations Document J, this increaser is suitable for use with wood with less than 20% moisture, smokeless coal, gas, and oil appliances.
To achieve a complete and secure chimney system, it is crucial to use the increaser within the masonry chimney, ensuring no flexible flue liner is exposed. Proper installation includes securing the connection with fire cement, ceramic rope, or high-temperature sealant, ensuring a gas-tight seal. For maintenance, sweeping should be conducted by a competent person, ideally a HETAS registered sweep, to keep your system in optimal condition.
SKU: 25-100-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 | 25-100-MR |
| Size | Ø 100-125mm |
| Material | 0.6mm 316L Stainless Steel |
| Temperature Rating | Up to 600°C |
| Standard | BSEN 1856-2 T600 N1 W V2 L50012 G |
| Suitable Fuels | Wood (<20% moisture), Oil, Gas, Smokeless Coal |
| Installation | Within enclosed masonry chimney; secure with fire cement, ceramic rope or high-temperature sealant |
| Approvals | CE / HETAS Compliant |