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What are Closed-Building Conditions?

Updated: Jun 28, 2022

In order to run accurate short term radon tests, the house or property must observe closed-building conditions. If closed building conditions are not met, tests could be invalidated. Follow our checklist below to ensure your are following the correct protocols for your short term radon tests.


Additionally, closed-building conditions must be observed 12 hours ahead of the tests.


  • Windows and outside doors must remain closed except for ordinary occupant movements

  • Use of combustion appliances is prohibited (furnaces, fireplaces, etc.) unless used as primary

  • Whole house ventilation systems must be turned off unless in place for existing radon mitigation

  • Air-conditioning units can be used during the test

  • Severe weather events unusual for the property or home may invalidate the test


Questions about radon in your home or property?

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