sw/flex 1″ increaser for enameled single wall connecting flue pipe for solid and multifuel applications. Midtherm Vitreous Enameled flue pipe is a single wall product manufactured and coated to the highest standards, made from thick zero carbon steel. Available in diameters from 125 to 150 mm – Stocked in sizes from 125 to 150 mm Maximum operating temperature 600 deg C Standard finish is: High temperature acid resistant vitreous enamel (Available in a matt black enamelled finish only) Supplied Boxed and fully labelled 1 year manufacturer’s warranty for all products installed and maintained in accordance with the installation and usage notes. Suitable for the following Applications: Ventilation and Extract, Gas, Oil, Solid Fuel, coated both internally and externally with a ground coat and top coat of high temperature resistant and acid resistant vitreous enamel coating. Due to the chemical specification of the steel used for this product, it provides an excellent surface for the glass coating to adhere to. Notes: All infomation is correct at 13 Feb 2018 and subject to change without notice. All flue system installations, i.e. oil, gas, solid and multi fuel, should be carried out by a suitably qualified installer or Building Control Department permission must be granted.