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BUILDING FABRIC & EXTERIORS than 5 m3 (m2 -h)–1 at 50 Pa for three


storeys, however wet zones that are situated remotely from a central hallway may need extract fans to be installed. The systems can also be extremely


energy efficient, providing heat distribution benefits, which can reduce annual space heating costs by 10 per cent.


Poor indoor air quality is a growing


Finally, there is an alternative option for self-builders or home renovators that includes systems with BBA accreditation, such as positive input ventilation (PIV). PIV units draw in fresh, filtered and clean air from outside, gently ventilating the home from a central position on a landing in a house or the central hallway in a flat or bungalow. Moisture-laden air is diluted, displaced


and replaced to control humidity levels around 55 per cent. This significantly


reduces or eliminates surface condensation, which is the main cause of mould growth. With lower humidity levels, there is less opportunity for dust mites to proliferate which means that asthma sufferers can experience the immediate health benefits of better indoor air quality. Trickle vents are generally not required unless the dwelling volume is greater than 120 m3 and airtightness is greater than 3 m3 h)–1 at 50 Pa for two storeys and greater


, (m2 -


Phil Harrison is domestic ventilation manager at EnviroVent


problem in our homes and as new properties are required to be built to be more airtight than ever before, ventilation needs to be given equal consideration. Condensation and mould are one of the biggest concerns for householders, with a recent survey revealing that 20 per cent of people reporting it was causing them an issue in their home. And, with a recent study by Professor Awbi of University of Reading revealing that asthma cases are set to increase by 80 per cent by 2050, there is a very real need to address the issue of installing efficient ventilation systems into a property. Aside from the health- related benefits, another consideration is that choosing the right ventilation system can also add value to a property.


january/february 2018


www.sbhonline.co.uk


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