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Midtherm Flue Systems Limited 

"Flue and Chimney Systems for all applications"

    Independent flue system manufacturer manufacture and supply prefabricated flue & chimney systems, natural draught ventilation, natural light systems and associated components for commercial, industrial and domestic use. 


Single Wall Flue

  • SW 430&304 - Single Wall Flue systems suitable for use on gas & oil fired equipment.
  • Vitrelux - Flue pipe manufactured from zero carbon steel, coated internally & externally. 
  • SW Galv - Single Wall ductwork manufactured in aluzinc coated mild steel, suitable for ventilation & extraction. 
  • CPS - Single Wall produced from 316 stainless steel 0.5mm thick suitable for use on a wide range of heating process and ventilation applications.
  • SW316 - Stainless steel ridged liner available in 22g and 1mm. 

Twin Wall Flue

  • Gas Vent - Twin wall flue system suitable for use on domestic gas fired appliances which have a draught diverter.
  • LTZ - Twin wall 304 stainless steel inner, 10mm of insulation and zalutite outer for use on gas fired boilers with flue gas temperatures up to 250°C continuous firing.
  • LT(LD/GV) - Twin Wall flue system, Aluminium inner liner, 25mm air gap and embossed aluminium (stucco) outer liner. Suitable for use on gas & oil fired equipment with flue gas temperatures not exceeding 260°C. 
  • PS - Single & Twin Wall versions of this system have a fully welded inner liner, capable of operating at pressures up to 1700mm wg. 
  • LT (LT/SS), MT, HT, HT Plus - Twin Wall Insulated flue systems for gas & oil fired applications up to 380°C, MT up to 540°C and HT up to 740°C. 

Flexible Flue

  • Midflex Euroflex - Gas & Oil Flex Packs, Euroflex 904L, Midflex 316L

Sundry Items 

  • Aquarius - Silicone and EPDM Flexible Roof Flashings 
  • Lead Slates - Flexible Lead Roof Flashings 
  • Rotorvent - Aerodynamic Spinning Cowls 



  • Combivent - Designed to allow the vertical discharge of flue gases through a roof mounted unit.
  • Windvent - A natural ventilation system operating on aerodynamic principles. 

Natural Lighting

  • DuctLight - An efficient means of illuminating any area by means of conducting natural daylight through a Super reflective tube. 

Fan Assisted

  • Fluevent Fans - Inline Flue Boost Fans 
  • Fluevent Units and Fan Dilution Systems - A low noise, low cost, aesthetically pleasing alternative to conventional flue dilution systems. 


  • Radiant Heaters - Gas fired radiant tube heating, suitable for industrial & commercial applications.



Registration Number: 00936960
VAT Number: n/a
Registered at Companies House:8 August, 1968 (55 years and 6 months ago)
No of Employees: n/a
Annual Turnover: n/a
Company Type:
  • Manufacturer
  • Service Providers

Opening Times

Monday 09:00 AM - 05:30 PM
Tuesday 09:00 AM - 05:30 PM
Wednesday 09:00 AM - 05:30 PM
Thursday 09:00 AM - 05:30 PM
Friday 09:00 AM - 05:30 PM
Saturday Closed
Sunday Closed

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Additional Information

Company Certifications

ISO 9001:2015 - Quality management systems – Requirements

Financial Information

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