Ventilation-based mitigation

Improved ventilation reduces the concentrations of all indoor air impurities. An HPAC expert can help to assess the situation.

There are a number of possible measures: Improving ventilation, installing fresh air ventilators, increasing the fan operating time, installing a new ventilation device, or balancing and cleaning the mechanical supply/exhaust air system. With these measures, a decrease of more than 50 per cent in radon concentration has rarely been achieved.

In dwellings with mechanical exhaust air ventilation, the underpressure in the house is considerably higher compared with houses with natural ventilation or mechanical supply and exhaust ventilation. Underpressure increases currents of radon-bearing air from the soil.  Unerpressure-related problems are more significant in houses with tight-proof structures, such as concrete element houses.

Installation of fresh air ventilators reduces the underpressure by a few dozen per cent and very rarely by more than 50 per cent. The radon concentration usually decreases similarly.

Installation of mechanical supply and exhaust ventilation is usually a rational solution only if it improves other aspects of air quality as well. The benefits of the installation of mechanical exhaust ventilation are modest on average. Sometimes it may even increase the radon concentration.

HPAC companies can assist with the planning of ventilation-related mitigation measure. 

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