Why choose Central Ventilations?
Our Story
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Meet the Team
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Frequently Asked Questions
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MVHR (mechanical ventilation with heat recovery) supplies fresh air to all habitable rooms. It also removes moist stale air, reusing the heat to pre-heat the fresh air entering the building.
As early as possible! Ideally just after the project has received planning permission. It is really hard to add an MVHR system into a low energy or Passivhaus building design later on in the process. Our designers will work closely with engineers and architects to overcome any possible issues at the design stage.
Although MVHR could be installed in all types of building, we generally would recommend it for buildings with good airtightness levels, for example where the air permeability of the thermal envelope is at or below 3 m3.hr/m2 @50Pa. For comfort, and to reduce the carbon emissions of homes, it is important that homes have good airtightness levels, as well as good ventilation levels.
Recent research by the Passivhaus Trust has shown that MVHR ventilation could be used in less airtight homes (eg even a fairly draughty home of 9 m3.hr/m2 @50Pa) as it would still have lower carbon emissions rate than natural ventilation. However, in very draughty homes (eg higher/ worse than 9 m3.hr/m2 @50Pa) the efficacy and efficiency of an MVHR will decrease.
Yes you can and the MVHR system will continue to operate in the background. However the efficiency of the MVHR will usually be slightly reduced, affecting its ability to keep the building warm in winter and cool in summer. The exception to this is when windows are opened for summer purging (see below).
Vent Axia domestic MVHR systems typically have 2 very small motors which push the air through your system. An MVHR unit like Focus 200 uses 22 Watts. This is similar to having a low energy light bulb on in your home, costing around 10p per day.
We design MVHR systems to have minimal noise impacts and they should run almost silently. It is important not to block any of the air vents as this will put the whole system out of balance.
Apart from keeping all the air vents clear and clean, the only maintenance is periodic filter changes. There are several filters which need to be changed to keep the air flowing properly. How frequently depends on where you live and how clean the air is. The filters keep your air clean, but are also needed to keep the system working properly. The kitchen extract filter may need changing/ cleaning more often than the others. Normally filters need to be changed every 3-6 months.
MVHR will re-use the heat which already exists in your home produced by occupants and electrical equipment. Some systems can be designed to have an additional in line heater, to heat supply air, but this can only provide a small amount of heating.