64 HEATING & RENEWABLE ENERGY SUPPLEMENT


A WAY TO ADDRESS POLLUTANTS IN OUR HOMES IS TO DISPERSE THEM THROUGH EFFECTIVE VENTILATION


supply and extract, are recognised as the most proficient means of ventilating a modern property. Mechanical Extract Ventilation (MEV)


and Mechanical Ventilation with Heat Recovery (MVHR) systems actively extract air from wet rooms (kitchens, bathrooms, utility spaces) via ducting to a central ventilation unit which exhausts to the atmosphere. In the case of MVHR, there’s the added benefit of supply and extract ventilation combined as these systems reuse waste heat from the extract air and use it to efficiently pre-warm the fresh air drawn into the building using a heat exchanger. The filtered, pre-warmed air is then distributed around the home, effectively meeting part of the heating load in energy efficient dwellings. New MVHR units feature advanced heat exchange proficiency enabling up to 95% of waste heat to be recovered. They come


with 100% thermal (summer) bypass which automatically activates when the air temperature reaches a pre-set level, allowing in cooler, fresh, filtered air without warming it through the heat exchanger.


Both MEV and MVHR systems provide effective ventilation, are energy efficient and extremely effective at dispersing polluted air. Even with these clever systems, they still rely on bringing outdoor air in so, in more polluted areas such as cities, you will need to combine them with a filter. Because of the nature of these systems,


which require extensive ducting, they are mostly suited to new build properties. For existing properties, the most cost-effective options are bathroom and kitchen inter- mittent extraction fans (axial and centrifugal) and Positive Input Ventilation units (PIV). PIV units are a cost-effective method of eliminating moisture from the home by gently pressurising a dwelling to expel stale and humid air through natural ventilation points. They can be mounted either in the loft area of a house, or a hallway cupboard of a flat.


GETTING TO GRIPS WITH INDOOR AIR QUALITY We certainly don’t want to detract from


the work being done to improve external air quality – it’s literally life saving – but we do need to start taking indoor air quality seriously. We should feel safe in our homes.


Paul William is product manager for Domus Ventilation.


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