Reduce risk of contaminant infiltration caused by undesirable negatively pressurized spaces.
Design the building such that the overall building pressure, with all air moving equipment in normal operation, is slightly positively pressurized with reference to outside.
During the Final Site Inspection, the ECLC Technical Advisor will test the building pressure differential. If a negative indoor pressure of more than three Pascals with reference to the outdoors is measured, the ECLC Technical Advisor will advise the project to make adjustments to supply and/or exhaust rates.
Example: Airflow Balance Chart
- Provide air balance summary table to demonstrate total system OA exceeds total system exhausts. See example above
- Building Pressure Differential Test by ECLC Technical Adviser
Associated Air Balance Council www.aabc.com
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