Chimney effect is the phenomenon whereby heated air rises naturally and at the same time cooler air is drawn in from lower parts of the building or from outside, creating vertical air movement within the building. The magnitude of this phenomenon depends on the temperature difference and height of the building and the tightness of the envelope.
Its effects can affect both the comfort of users and the energy losses. In prefabricated houses, which are characterised by high airtightness, the chimney effect is generally limited. Nevertheless, its inadequate consideration can result in uncontrolled air infiltration, disruption of gravity ventilation and localised cooling of the envelope.
Appropriate design of ventilation openings, supply and exhaust zones and the maintenance of insulation continuity make it possible to minimise the negative consequences of the chimney effect. It also helps to maintain a stable indoor microclimate.
