HEATING, VENTILATION & SERVICES
only meet the emission limits required by Defra, but also stoves that produce fewer emissions. Wood burning is a low carbon form of heating. Logs are generally the offcuts that come from pruning trees. Woodlands need to be managed to stay healthy and part of that management is pruning. Interestingly, burning wood in a modern stove will produce less carbon than if it was left to decay on the woodland floor.
FLUES AND CHIMNEYS
It has been common practice to include a 200 mm flue and a standard fire opening when building a house. Wood burning stoves require a smaller flue diameter, typically 150 mm. Installing a smaller diameter flue has the benefit of substantially reducing the air loss in the SAP calculation. The general opinion is that new open fires may not be able to meet the new emission limits, and therefore it is worth checking this before deciding to have an open fire.
The stove and the associated flue chimney should be considered as one system. The purpose of the fluechimney is to safely conduct the products of combustion into the atmosphere. A straight chimney is always the best
solution, but where this is not possible – due to the construction of the dwelling – the number of bends should be kept to a minimum and not exceed more than four. Also, the angle of the bends should be no greater than 45° from the vertical, so the route of the chimney within the dwelling should be thought about at the design stage.
Another important consideration is consistent insulation along the complete length of the flue the inner tube within the chimney that transports the flue gases). Clay, concrete and pumice liners require insulation to be prepared and added onsite. Stainless steel and ceramic system chimneys are supplied with effective insulation. Double wall pumice chimney systems have an air gap between the walls of the inner and outer blocks. The air gap combined with the natural insulating properties of pumice provides effective insulation along the length of the chimney. aintaining the flue gas temperature will enable the flue gases to freely escape into the atmosphere.
CORRECT INSTALLATION It is worth remembering that installing a stove and flue is not a I job. It should only be undertaken by a competent person and the work must be inspected
by Building Control. England and Wales operate competent schemes which allow the registered installer to self-certify the installation. HETAS and OFTEC are two of the main companies running such schemes. The Environment Act also recognises the need to burn dry wood, and to regularly maintain the wood burner. Burning dry wood, and regularly sweeping the chimney or flue will reduce the build-up of soot and help keep the flue gases flowing freely. ry wood, with a moisture content below 20% produces more heat and fewer emissions than wet wood, so the stove owner and the environment both gain from burning dry wood. Logs banded ‘ready to burn’ are guaranteed to have a moisture content of less than 20%. If you prefer to gather your own wood it must be dried before it can be burnt. Typically, drying or seasoning wood can take 18 months.
Installing a wood burning stove may not be at the heart of the government’s heating strategy, but it can enhance the heating of any home. It can complement a heat pump, and provide heat security in severe winters.
Dennis Milligan is vice president of the BFCMA
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www.sbhonline.co.uk
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