Screw-FIX Increaser, 1mm - Ø 175-200mm (25-175-MR1)
At a Glance
- 316L stainless steel construction for enhanced durability
Transitions flue diameter from 175mm to 200mm for a secure fit
Compliant with Building Regulations Document J
Suitable for wood (with <20% moisture), oil, gas, and smokeless coal appliances
Designed for seamless integration with MI-FLEX liners and easy maintenance
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, July 8th. This is based on current lead times for this product. 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 on 01670 206 999. 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.
Best 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]
- Summary
- Specs
- Install
- FAQs
The Screw-FIX Increaser, 1mm thick and sized at Ø 175-200mm, is an essential component for flue system installations. This 316 stainless steel adapter acts as a transitional joint, seamlessly connecting single wall rigid flue systems to the highly flexible MI-FLEX 316 and 904 flue liners. Designed for versatility, it is suitable for solid fuels like wood (moisture content <20%), smokeless coal, gas, and oil, handling temperatures up to 600°C (T600 designation).Building Regulations Document J mandates its installation within masonry chimneys, prohibiting non-masonry enclosures such as timber or plasterboard boxing. The bottom fixings ensure a gas-tight seal using fire cement, ceramic rope, tape, or high-temperature sealant, preventing the flexible liner from being exposed.Easy provision for maintenance is a key feature, requiring routine cleaning and sweeping by a certified professional, preferably a HETAS registered sweep. Solid fuel systems should be swept at least twice annually to ensure safety and efficiency, removing any blockages or deposits like bird nests.
SKU: 25-175-MR1
| Technical Specifications | |
|---|---|
| Material | 316L Stainless Steel |
| Thickness | 1mm |
| Diameter Transition | 175mm to 200mm |
| Temperature Rating | Up to 600u00b0C (T600) |
| Fuel Compatibility | Wood (<20% moisture), Oil, Gas, Smokeless Coal |
| Standards | CE / HETAS compliant |
| System Compatibility | Single wall flue systems to MI-FLEX 316/904 flue liners |
What our experts say!
"The Screw-FIX Increaser is a top-tier product that ensures a smooth transition from single wall flue systems to MI-FLEX liners. Perfect for various fuels and compliant with Building Regulations, it's a favourite among our trade and retail customers. With reliable nationwide delivery, National Flues ensures you get the best at unbeatable prices."
The Screw-FIX Increaser is used to connect a rigid single wall flue system to a flexible MI-FLEX flue liner, ensuring a seamless and secure transition.
National Flues is a leading supplier of fireplaces and flues across the UK, catering to both retail and trade customers. Renowned for competitive pricing and reliable delivery, we provide high-quality products and top-tier customer service.
