IEQ R6: Building Designed for Positive Pressure

Requirement

PURPOSE

Reduce risk of contaminant infiltration caused by undesirable negatively pressurized spaces.

CRITERIA

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

VERIFICATION 

• 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

RESOURCES

Associated Air Balance Council www.aabc.com