Closed House Conditions

Closed House Conditions means that all doors and all windows on all levels of the house must be kept closed, except for normal entry and exit through first floor doors. Heating and air conditioning equipment should operate normally. Window or wall mounted air conditioners may be used if the fresh air damper is set to the closed position. Fireplaces and wood stoves may not be used unless they are the primary heat source for the house. Whole house fans may not be used during the test. If the house has a permanently installed radon reduction system, it should be operating normally for at least 24 hours before the test begins and during the 48 hour test period. The current owner and/or occupant must agree to maintain these conditions before the test will be started.

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