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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 balanc-
ing worksheet as shown.
AIR BALANCING—DIFFUSER READINGS
4. When the procedures instruct you to apply an average veloc-
ity reading, divide the opening into a number of equal areas
and determine an average of single readings taken at the cen-
ter 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.
