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ducted systems | definitions

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

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

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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Todays Date: 7th September, 2010		 Exa Web Solutions