Once radon enters a building, it decays in the air and continues decaying through the short-lived decay process. Radon must be continuously removed by ventilation fans, pressurization or mixing with fresh air before the decay process can begin. When indoor air pressure is lower than soil gas pressure, soil gas is sucked into the house This happens at its highest levels in the winter months, when the building is tight and the heating is on, causing warm air to rise and requiring the building to demand more air. Many methods of radon reduction or mitigation involve changing these air pressures naturally or mechanically. Natural methods of radon mitigation include opening windows, installing dampers to prevent low indoor air pressure, caused by home or office appliances or heating units, sealing breaks and seams in slabs, and covering exposed soil in basements and crawl spaces.
Fans are the primary mechanical means of reducing radon gas in a home today.
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