Heat
recovery ventilation systems work by both supplying
and extracting air throughout your home, 24
hours a day, 7 days a week to give continuously
good air quality.
Air is extracted continuously from the wet rooms in the house (I.e.
the kitchen and bathrooms). This air passes into the ventilation device
and over the heat exchanger unit, which can recover up to 93% of the
heat in the air that would otherwise be lost.
At the same time, air is continuously drawn in from the atmosphere
and ducted to habitable rooms (living rooms and bedrooms) to provide
a balanced ventilation system.
These products can reduce the CO2 emissions of a dwelling by 'salvaging'
and re-introducing heat into the property which would otherwise have
been exhausted if you were using a conventional system without heat
recovery. This energy saving contributes to a reduced DER (Dwelling
Emission Rate) in SAP.
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Heat
recovery uses just a few Watts of energy (<1W/l/s)
to recovery many kiloWatts of otherwise lost
heat from buildings through conventional ventilation.
This means lower fuel bills and carbon emissions. 
