UpCodes logo
Go To Full Code Chapter
The building or dwelling unit shall be tested and verified as having an air leakage rate of not exceeding 4 air changes per hour. Testing shall be conducted with a blower door at a pressure of 0.2" w.g. (50 pascals). Where required by the code official, testing shall be conducted by a certified independent third party. Certification programs shall be approved by the state construction code commission. A written report of the results of the test shall be signed by the party conducting the test and provided to the code official. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope. During testing all of the following apply:

  1. Exterior windows and doors, fireplace, and stove doors shall be closed, but not sealed, beyond the intended weather stripping or other infiltration control measures.
  2. Dampers including exhaust, intake, makeup air, backdraft, and flue dampers shall be closed, but not sealed beyond intended infiltration control measures.
  3. Interior doors, if installed at the time of the test, shall be open.
  4. Exterior doors for continuous ventilation systems and heat recovery ventilators shall be closed and sealed.
  5. Heating and cooling systems, if installed at the time of the test, shall be turned off.
  6. Supply and return registers, if installed at the time of the test, shall be fully open.


R 408.30547d

Related Code Sections

7.5 Service Water Heating, Prescriptive Path
is the fraction of the year when the outdoor daily mean temperature is greater than 64.9°F. The standby loss is to be determined for a test period of 24 hours ...
R502.1.1 [RE] Existing Buildings, Prescriptive Compliance
) in unconditioned spaces shall not be required to be tested in accordance with Section R403.3.3 ...