Airflow
Volume of air moved, measured as cubic feet per minute. Usually given at 2" opening.
Airflow Calculation
CFM = 13.35 d² (square root) VAC in H2O"
Needed - Diameter of orifice plate
vac - Inches of water lift
* Vacuum must be corrected before being put into equation. To correct, temperature and barometric pressure must be accounted for.
Air Watts
"Cleanability Rating"
Amps
Current draw of the motor.
Horsepower
- Peak Horsepower (PHP): Maximum instantaneous horsepower capabilities of motor (most frequently used).
- Input HP: Maximum watts divided by 746.
- Operating HP: Watts as operating point divided by 746.
Motor Speed
Measured in revolutions per minute. (RPM)
Operating Orifice
Restriction typical of operating conditions.
Orifice
Simulation of restrictions (impedance) in a cleaner system.
Overall Efficiency
"Measure of Fan Efficiency"
Restrictions
Hose, wands, filters, carpet, water, foam (anything which impedes airflow), voltage fluctuation.
Standard Conditions
120 volts, 60 Hz., corrected to standard conditions of 29.92 barometric pressure and 68º F.
Vacuum
Inches of water lift. (Usually given at 0" opening).
Watts
Electrical power consumption of the motor.
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