The Midtherm HTS 125mm (5") Twinwall Radiation Shield can be extended to suit the joist height and is set at a diameter to fit in between the flue outer casing and the joist box. The length can adjusted to suit a joist height of 150-250mm and should be used between a firestop and collar and ventilated support/non-support plate. Available in aluminium, this fixing does not have an internal diameter, however it is designed for use with 125mm twinwall with an outside diameter of 180mm. HTS is a Class 1. Twinwall chimney product manufactured by Midtherm Flue Systems right here in the UK and is suitable for use in both domestic and commercial applications.
Midtherm are a family run British company that have been manufacturing for over 45 years. Founded by Ray Andrews in 1970, Midtherm has steadily grown over the years into one of the leading chimney manufacturers in the industry. The HTS range is the culmination of years of design and development work, and is a firm favourite within the heating industry.