Screw-FIX Increaser - Ø 100-125mm (25-100-MR)
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
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, July 1st. This is based on current delivery times for this product. Delivery for products not in our warehouses can be delayed because of third party carriers. If you need a stove, or other bulky product, to be delivered by a specific time in the next 7 days then please 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 and you can read in our blog about they types and terms and conditions for warranties. Mi-Flex flue liner, for example, comes with a lifetime guarantee. Give us a call if you want to know about a specific warranty. 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.
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 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
| Technical Specifications | |
|---|---|
| SKU | 25-100-MR |
| Size | u00d8 100-125mm |
| Material | 0.6mm 316L Stainless Steel |
| Temperature Rating | Up to 600u00b0C |
| 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 |
