11
For maximum accuracy, observe the following precautions:
1. Use only the appropriate diffuser, register or grille manufacturer’s
measuring procedures.
2. Make a complete and accurate velocity reading.
3. Record the velocity measurements on a diffuser air balancing
worksheet as shown.
4. When the procedures instruct you to apply an average velocity
reading, divide the opening into a number of equal areas and
determine an average of single readings taken at the center of the
equal areas.
5. When making a record of the measurements, include room location,
outlet model, flow factor, design air volume if known, measured
outlet velocity and calculated air volume.
AIR BALANCING—DIFFUSER READINGS
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