86 HEATING, VENTILATION & SERVICES
design, MVHR systems are now being developed which are as simple as possible to install and commission. App-controlled functionality offers simplified installation and commissioning, saving time on site, reducing build length and improving build quality. It also encourages best practice, in turn ensuring efficient performance and adequate ventilation – minimising the chances of poor IAQ.
The threat of Covid-19 has brought renewed focus to filtration in buildings. Inside an MVHR unit, fresh incoming air passes through a filter to remove pollen, debris and products of pollution. This protects the heat exchanger from blocking and ensures the indoor air is cleaner and healthier than the air that would come in via a window. Filters up to ISO ePM2.5 70 per cent (F7 grade) ensure even homes in heavily urbanised areas can filter out most impurities, up to and including PM2.5 particles, for example diesel particulates. A filter check warning can alert households when filters need changing, thus helping to maintain the quality of incoming air. To go one step further to improve IAQ, there are filtration units now available that are fitted to
MVHR unit’s intake airflow and incorporate two types of filtration – activated carbon and particulate filters to achieve even higher levels of filtration. Meanwhile, in thermally efficient homes overheating can be an issue. Therefore, architects should consider MVHR units with 100 per cent Summer Bypass to help ensure thermal comfort, a significant issue in air-tight new build properties. Sophisticated summer bypass systems feature an evening or overnight purge, allowing occupiers to choose when to take advantage of cooler air during hot summer periods.
As buildings become more efficient, their air tightness will continue to improve making effective ventilation ever more important to help provide good IAQ for households, especially since Covid-19 could mean more home working from now on. MVHR not only provides good IAQ to make homes healthier, but as an energy efficient ventilation solution it is also the ideal choice for new build homes on the road to net-zero.
Richard Paine is marketing director at Vent-Axia
WWW.ARCHITECTSDATAFILE.CO.UK
ADF APRIL 2021
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