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CLOSED HOUSE CONDITIONS
Be aware that any test lasting less than a week requires closed-house conditions.
Closed-house conditions mean keeping all windows closed, keeping doors closed except for normal entry and exit, and not operating fans or other machines which bring air in from outside (except for fans that are part of a radon reduction system, or small exhaust fans that operate for only short periods of time).
Note that professional measurement licensees are required to post Radon Measurement in Progress Notifications at every building entry. |
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• Before Testing: Begin closed-house conditions at least 12 hours before the start of the short-term test.
• During Testing: Maintain closed-house conditions during the entire duration of the short term test, especially for tests less than one week in duration. Operate home heating or cooling systems normally during the test. For tests lasting less than one week, only operate air conditioning units that recirculate interior air.
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