Products / Twin Wall Flue
Matt Black HT-S - Summary

Matt Black HT-S - Summary | Technical | All


Powder Coated Matt Black HT-S.

Powder coated matt black HT-S twin wall class 1 flue.

  • Available in sizes from 130 to 150  mm
  • Stocked in sizes from 130 to 150  mm
  • Maximum operating temperature 450 deg C
  • Standard finish is: Matt Black Power Coat

  • 1 year manufacturer's warranty for all products installed and maintained in accordance with the installation and usage notes.

  • All products can be powder coated to any BS or RAL colour code

Matt Black HT-S is suitable for use on the following applications:

Matt Black HT-S Description:

  • Midtherm HT-S is a Class 1 Twin Wall insulated flue system for medium/high temperature, gas, oil, solidfuel and multifuel applications. Powder coated Matt Black, in a full architectural polyester powder - TGIC with a 30% gloss level. Matt black HT-S is available in 125mm, 150mm, 175mm, 200mm, 250mm, 300mm and 350mm.

  • HT-S has a 0.5mm 316L 2B grade stainless steel inner liner with a welded seam, 0.5mm 304 BA grade stainless steel outer casing with a welded seam and 25mm high density mineral wool insulation. HT-S has a smooth, modern appearance, the external liner has a mechanically formed socket and spigot connection that ensures a consistent, easy, close fitting joint every time. The locking band has an over centre stainless steel clip that is easy to secure. This locking band is a channel type giving a smooth line to the system and improving aesthetic appearance of the flue.

  • HT-S is designed for the domestic and commercial market serving gas, oil, solid and installations, peat, wood and other biomass. Midtherm HT-S has a high temperature or low temperature negative pressure designation depending upon the components used and the installation design making it a good all round product for multiple installation requirements.

Matt Black HT-S Installation and Usage Notes

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.


For detailed installation guidelines please refer to:

  • The relevant Technical Information and Installation Instructions
  • Building Regulations
  • Planning Office
  • Appliance Manufacturers Operating and Maintenance Instructions
  • Relevant British Standards




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