An air balance report documents the distribution of conditioned air throughout building spaces, confirming that airflow matches design specifications and occupant comfort requirements. This report measures supply and return air quantities at each register and compares actual performance against architectural design documents. Air balance reports ensure proper ventilation rates and temperature uniformity across occupied zones.
Technical Details
Air balance technicians measure velocity at each supply register using calibrated anemometers, calculate individual register CFM, sum total measured CFM, and compare against design CFM for each zone. Reports record static pressure at the air handling unit plenum, filter pressure drop, fan motor amperage, and temperature differentials between supply and return air. Variance from design is calculated as a percentage, typically within 10 percent tolerance.
Practical Significance
Air balance reports confirm adequate ventilation for code compliance under ASHRAE 62.1 standards and ensure occupant comfort by verifying uniform temperature distribution. Reports provide documentation for building inspections and warranty protection. Unbalanced systems cause occupant complaints and energy waste, making air balance reports essential for new construction and major renovation projects.