6.6201.4 Balancing—Makeup/Outside Air (All Building Types)

Whole Building Ventilation
Air Flow Requirements
Desired Outcome: 
Ventilation equipment operates as designed
For supporting material, see Referenced Standards.
Validate air distribution system installation

System will be checked for existence of specified system components

Confirm installed system

Familiarize with system components

Verify system readiness for testing

Testing equipment selection

Measurement equipment will be selected so that design value will be within the accurate range of the measuring device

Equipment will be capable of accurately measuring +/- 10% in general case

If design flow is less than 100 cubic feet per minute ( CFM CFM Cubic feet per minute ), equipment will be capable of accurately measuring down to 10 CFM CFM Cubic feet per minute (+/- 5%)

Static pressures will be measured using manometers capable of measuring +/- 1 pascal

Measurement equipment will be calibrated and field checked in accordance with manufacturer recommendations

Ensure accurate measurements of ventilation rates

Test main fan or air handler unit

Equipment testing will check for:

  • Proper operation (programmed schedule/sequence of operation)
  • Proper rotation
  • Filter condition
  • Total flow at fan

Air flows will be measured in accordance with ANSI ANSI American National Standards Institute, www.ansi.org / ACCA ACCA Air Conditioning Contractors of America, www.acca.org Standard 5 or ANSI ANSI American National Standards Institute, www.ansi.org / ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org Standard 111; all measured values will be recorded and compared against design specifications

Fan flow will be adjusted to meet design specification

Verify performance of air handler system

Measure air flow and static pressure at terminals

Air flow and static pressure will be measured and recorded

Measurements will be taken with terminals as found, with no adjustments made to the grille fins

All measured values will be recorded and compared against design specifications

The terminal with the lowest flow will be identified and recorded

Verify distribution system

Identify potential adjustments

Establish baseline air flow rates

Adjustment of system

Adjustments will be made to fan speed, dampers, and registers until design specifications are met

Balance system utilizing least resistance and energy

Final balance

Final air flow and/or pressure will be measured, confirmed, and recorded at fan and terminals

Provide acceptable thermal comfort, energy efficiency, and indoor air quality

Occupant/property manager education

Occupant/property manager will be:

  • Instructed on proper operation and maintenance procedures
  • Educated on value and need for recommissioning requirements

Property manager will complete a 30-hour OSHA OSHA U.S. Occupational Safety and Health Administration, www.osha.gov safety education course

Ensure continued operation of equipment at design performance levels