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www.heatingandventilating.net


As Things Heat Up


Why early flue specification matters for new projects, refurbishments and autumn plant demand


A


s September brings commercial heating plant back into sharper focus, building services teams are looking again at


reliability, safety and performance. Boilers may have been operating at lower loads through the summer, but as demand builds, plant rooms are expected to respond consistently and efficiently. At the same time, many consultants, contractors and specifiers are planning new projects, refurbishment schemes and plant replacement programmes where flue and exhaust routes need to be considered from the outset. Whether the project involves a new commercial boiler installation, biomass plant, generator exhaust, CHP system or specialist process application, early flue specification can make a significant difference to system performance, installation and long-term reliability. For Midtherm, a flue system is not simply a


route to atmosphere. It must be designed around the appliance, the fuel, the operating temperature and pressure, and the environment in which it will perform. Across commercial and industrial buildings, flues are required to manage condensate, corrosion, particulates, heat and safe discharge while integrating with increasingly complex plant layouts.


Modern condensing boiler installations are a


clear example. Lower flue gas temperatures and acidic condensate demand materials and system designs that support long-term durability and safe drainage. In CHP and generator exhaust applications, priorities can shift towards pressure,


10 September 2026


temperature, vibration, acoustic control and operational resilience. Biomass systems bring further considerations around combustion products, cleaning access and particulate levels, while specialist process and extraction applications such as commercial catering, coffee roasting and spray booth environments require robust systems designed for heat, fumes and continuous use. In new-build and refurbishment projects, these


requirements can be even more critical. Plant rooms are often compact, service routes can be congested, and roof penetrations, structural support, thermal movement and maintenance access all need careful coordination. Leaving the flue system too late in the design process can create avoidable challenges around routing, installation, compliance and commissioning. That is why Midtherm’s approach is centred on


application-led specification. Fuel type, pressure class, condensate resistance, corrosion risk, structural support and access requirements can all influence system design. When these factors are considered early, consultants and contractors are better able to deliver systems that are fit for the way the building will operate. Based in Dudley in the West Midlands, Midtherm has built more than five decades of UK manufacturing experience around this practical engineering approach. The company manufactures flue and chimney systems for commercial heating, industrial process, biomass, CHP, generator exhaust and specialist extraction applications, supporting


specifiers with technical understanding as well as product supply. Midtherm’s systems are supported by type-tested


approvals to BS EN 1856 alongside ISO 9001 quality management accreditation, giving confidence that products are manufactured within a controlled and standards-led environment.


As autumn demand builds and new projects


continue to move forward, the message is clear: flue systems should not be left as an afterthought. Effective flue design starts with understanding how the system will perform in practice. Need support with your project? Midtherm can help specify the right solution. t 01384 458800 e sales@midtherm.com www.midthermflue.co.uk


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