NA5.5 Enclosure Measurement Procedures
NA5.5.1 Pressurization Test
  1. Reference ASTM E3158-18 for Whole Building Air Leakage Testing.
  2. Record interior and exterior weather conditions.
  3. Record average wind speeds.
  4. Record interior and exterior temperatures before the testing begins.
  5. Record site elevation in feet above sea level.
  6. Measure bias pressures with fans off and covered.
  7. Perform a multi-point pressurization test from at least +25 to +50 Pa (leakage is reported at 75 Pa, as attained or extrapolated).
  8. Record a minimum of 5 points between minimum and maximum induced pressures.
  9. Measure bias pressures at end of multi-point test with fans off and covered.
  10. Record interior and exterior temperatures.
  11. If the pressure exponent n is less than 0.45 or greater than 1.0 per Section 9.5.1 of ASTM E3158-18, then the pressurization test is invalid and shall be repeated.
NA5.5.2 Depressurization Test
  1. Reverse direction of fans.
  2. Measure bias pressures with fans off and covered.
  3. Perform a multi-point depressurization test from at least -25 to -50 Pa (optional).
  4. Record a minimum of 5 points between minimum and maximum induced pressures.
  5. Measure bias pressures at end of multi-point test with fans off and covered.
  6. Record interior and exterior temperatures after the testing is complete.
  7. If the pressure exponent n is less than 0.45 or greater than 1.0 per Section 9.5.1 of ASTM 3158-18, then the depressurization test is invalid and shall be repeated.

This panel displays referenced content when certain links are clicked.

This program is funded by California utility customers and administered by Pacific Gas and Electric Company (PG&E), San Diego Gas & Electric Company (SDG&E®), and Southern California Edison Company (SCE) under the auspices of the California Public Utilities Commission.

© 2024 PG&E, SDG&E and SCE. All rights reserved, except that this content may be used, copied, and distributed without modification. Neither PG&E, SDG&E, nor SCE — nor any of their employees makes any warranty, express of implied; or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any data, information, method, product, policy or process disclosed in this document; or represents that its use will not infringe any privately-owned rights including, but not limited to patents, trademarks or copyrights.