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Where two or more dwelling units are located within the building thermal envelope of a building, the testing procedure specified in Section R402.4.1.3 shall be permitted as an alternative to compliance with Section R402.4.1.2.
In this section, each dwelling unit and each other conditioned occupied space located within the building thermal envelope of the building shall be referred to as a "testing unit," and the "enclosure surface area" within a testing unit shall be equal to the sum of the areas of (i) each exterior wall in such testing unit, (ii) each interior wall in such testing unit that abuts other testing unit(s), (iii) each ceiling in such testing unit that abuts other testing unit(s) or abuts unconditioned space, and (iv) each floor in such testing unit that abuts other testing unit(s) or abuts unconditioned space.
Each testing unit shall be tested and verified as having an air leakage rate not exceeding 0.3 cubic feet per minute per square foot of enclosure surface area within the testing area. Testing shall be conducted with a blower door at a pressure of 0.2 inches w.g. (50 Pascals), and shall be conducted in accordance with ASTM E779. Testing shall be performed at any time after creation of all penetrations of the building thermal envelope.
During testing:
  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 or interior terminations 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. Where required by the building official, testing shall be conducted by an approved third party.
A written report of the results of the test shall be prepared and signed by the party conducting the test and provided to the building official. The written report shall include:
  1. The name and place of business of the party conducting the test;
  2. The address of the building which was tested;
  3. The conditioned floor area of dwelling, calculated in accordance with ANSI/BOMA Z65.1, except that conditioned floor area shall include areas where the ceiling height is less than 5 feet (1524 mm);
  4. Measurement of the air leakage rate of each testing unit;
  5. The date(s) of the test;
  6. A certification by the party conducting the test of the accuracy of the test results; and
  7. The signature of the party conducting the test.
R402.4.1.3.1 Buildings With More Than Seven Dwelling Units
When the optional testing procedure authorized by Section R402.4.1.3 is used for a building with more than seven dwelling units, testing each testing unit shall not be required, and testing of sample testing units selected in accordance with the provisions set forth below in this section shall be permitted, when approved by the building official.
  1. Testing units shall be grouped into sample sets of not more than seven testing units and common rooms in each sample set. Each sample set shall contain testing units that are representative of all dwelling unit types and all other conditioned occupied spaces.
  2. If all testing units in the first sample set tested are verified as having an air leakage rate not exceeding 0.3 cubic feet per minute per square foot of enclosure surface area within the testing area, remaining sample sets shall be permitted to be tested at the rate of one testing unit per sample set.
  3. If any testing unit tested in accordance with paragraph 2 above is not verified as having an air leakage rate not exceeding 0.3 cubic feet per minute per square foot of enclosure surface area within the testing area, two additional testing units in the sample set shall be tested.
  4. If any testing unit tested in accordance with paragraph 3 above is not verified as having an air leakage rate not exceeding 0.3 cubic feet per minute per square foot of enclosure surface area within the testing area, all testing units in the sample set shall be tested, and all testing units in the subsequent sample set, if any, shall be tested.
  5. If all testing units in the sample set tested in accordance with paragraph 4 above are verified as having an air leakage rate not exceeding 0.3 cubic feet per minute per square foot of enclosure surface area within the testing area, subsequent sample sets shall be permitted to be tested in accordance with paragraph 2 above, where approved by the building official.

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