View Full Version : calculating cfm
10-04-2005, 09:02 PM
how can I calculate the cfm per ton of a system using your temp.drop and static pressure can't remember formula and how can you figure static pressure with digital monometer thanks for the help
Buy a static pres. tip for you manometer, drill hole, stick tube in and read pressure.
Don't have a tip. ...use a small piece od 1/4 inch copper tube and just insert the tube about 1 inch into the duct.
As for airflow what do you really want to know? Actual CFM at discharge or actual BTU's of your evap. coil?
Velocity = 4005 * (square root) of Velocity pressure
CFM = area * Velocity
10-04-2005, 10:11 PM
10-05-2005, 07:37 PM
Do you have the fan performance data for the piece of equipment you are working on?
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