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Screw-FIX Increaser, 1mm - Ø 175-200mm

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This 1mm thick, 316 stainless steel Screw-FIX Increaser is expertly engineered to connect a rigid single wall flue system to a MI-FLEX liner. It increases the diameter from 175mm to 200mm, ensuring a smooth and efficient transition for your flue installation.

£69.99 incl VAT

  •   Description  
  •   Product Details  

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
  • Item: Screw-FIX Increaser 1mm - u00d8 175-200mm
  • Designation:: BSEN 1856-2 T600 N1 W V2 L50012 G
  • System:: MI-FLEX Accessories MF20
  • Material:: 316L
  • Colour Finish:: Stainless Steel / NATURAL
  • Fuels:: Wood, Oil, Gas, Smokeless coal
  • Approvals::
  • : CE / HETAS

What is it for?

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.

Brand Summary

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.

National Flues Verdict

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.

Our Rating
9.8/10

FAQs

The Screw-FIX Increaser is suitable for wood with less than 20% moisture, smokeless coal, gas, and oil appliances, handling temperatures up to 600°C.

The increaser should be installed entirely within a masonry chimney as per Building Regulations Document J. Non-masonry enclosures like timber or plasterboard are not acceptable.

A gas-tight seal can be achieved using fire cement, ceramic rope or tape, or high-temperature sealant. The connection should be made inside the confines of the existing masonry chimney.

Chimneys should be swept and inspected at least once a year by a competent person, with solid fuel systems recommended for sweeping twice a year. Only specialised tools and no chemical cleaners should be used.

No, the flexible flue liner should not be exposed. The transition should occur entirely within the masonry chimney to ensure safety and compliance.

You can find a list of HETAS registered sweeps at www.hetas.co.uk. It's important to use certified professionals for chimney maintenance.

The Screw-FIX Increaser transitions from a 175mm rigid single wall flue to a 200mm flexible flue liner.