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What Size Flue Pipe Do I Need3rd October 2017
But before you can think about how great it will look roaring away in the background on a cold winter’s evening, there are some important questions that need answering, and one of the most commonly asked is “what size flue pipe do I need?”
Well, the most important thing to remember is that the flue size must never be smaller than the size of the stove outlet. The Building Regulations require that the minimum flue size for stoves are as follows:
Up to 20kW burning smokeless fuel - minimum 125mm diameter.
Up to 30kW burning any fuel - minimum 150mm diameter.
That said, if the stove you have chosen is Defra Exempt and has a 125mm outlet, then a 125mm diameter flue may be used. For open fires with a standard opening up to 500mm x 550mm, the minimum required flue diameter is 200mm round or 175mm square. For larger open fires like Inglenooks which operate with a fire opening greater than 500mm x 550mm, the flue size should be at least 15% of the free unobstructed area (including the sides if open).
While the correct size flue is of course extremely important, there are many other factors you need to consider prior to the installation of your stove, such as insulation, chimney position, bends, connection, pots and terminals. An experienced installer will be able to provide advice and general guidance on the selection of stoves, flues and accessories, but it’s always best to make sure you do your homework too, and ensure the professional you choose is certified and conforms to the relevant regulations and standards.
If you're looking for more information on flue pipes, or a potential stove that you may be interested in. Give us a call today and we'll be happy to discuss.
