Description Overview The Mi-Flex FastFix-Screw Increaser – Ø125-150mm is part of the Fast-Fix Screw range of accessories, designed for seamless installation with Mi-Flex 316 and 904 flexible flue liners. It allows for quick, reliable installation with its push, twist, and lock mechanism, creating a solid connection between systems while maintaining a clean and professional finish. Specifications System Fast-Fix Screw MF21 Material 316L Stainless Steel Material Thickness 0.6mm Finish Natural Stainless Steel Diameter Ø125-150mm Designation BSEN 1856-2 T600 N1 W V2 L50012 G Maximum Operating Temperature 600°C Fuel Compatibility Wood, Oil, Gas, Smokeless Coal Installation Guidance Fit the increaser within the confines of the existing masonry chimney, ensuring no flexible liner is exposed. Securely fasten both ends with appropriate high-temperature sealants such as fire cement, ceramic rope, or high-temperature tape. The connection should remain gas-tight and comply with Building Regulations Document J. Maintenance Routine maintenance and sweeping should be carried out by a competent professional at least once annually, or twice per year for solid fuel systems. Do not use chemical cleaners or mild steel brushes on stainless steel chimneys. Inspections before and after each heating season are recommended to ensure there are no obstructions such as soot build-up or bird nests. Typical Applications Wood-burning stoves and multi-fuel appliances Gas and oil heating systems Solid fuel installations requiring flue size adaptation Safety & Compliance This product meets BS EN 1856-2 standards and is suitable for use as part of an enclosed masonry chimney system. Installation should be performed by a qualified professional to ensure compliance with UK building and safety standards.
