3. How Does A Ventilation System With Heat Recovery Work?
Heat Recovery is a process of continuously heating incoming fresh air, by using the heat energy
from outgoing stale, warm air and transferring a percentage of it to the incoming fresh air. This is
accomplished by passing the incoming and outgoing air through a highly efficient heat
exchanger. At no time do the airstreams mix as the heat radiates through plates of the heat
exchanger, so no odour issues are possible.
Extract Air
Stale air is contaminated with humidity and odours which are extracted from the kitchen,
bathroom, toilet, en-suite and utility rooms. Extraction vents in wet room areas allow a constant
air volume to be extracted.
This is backed up by a boost facility, removing stale air at a higher rate for a short period of time.
Supply Air
Fresh oxygenated air from outside passes through the filter and heat exchanger before being
supplied into bedrooms, living and dining rooms etc. This fresh air is drawn into the various wet-
rooms collecting pollutants on its way such as moisture, odours, allergens and volatile organic
components. The air is also heated as it passes from room to room using the statutory gap at the
bottom of internal doors when closed.
The now stale, polluted air is then drawn out of wet rooms through the heat recovery unit to
outside, completing the cycle.
Ventilation is necessary to provide a healthy and comfortable internal environment for a
building's occupants. The main task of ventilation is to remove polluted indoor air from a building
and replace it with fresh outdoor air.
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Extracted Air:
bathroom, en-suite, toilet,
utility and kitchen
Stale Air to Outside
Incoming Fresh Air
Heat Recovery Unit
Fresh Air from Outside:
bedroom, living-room and dining-room
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