POCKET REFERENCE GUIDE — 22
Fan Law 1
A 1,250 CFM fan is running at 750 RPM,
but it needs to supply 1,400 CFM. What is
the RPM required?
KEYSTROKE DISPLAY
o o 0.
1. Enter current CFM into “a” old:
1 2 5 0 Ç 4 A STORED 1250.
2. Enter new CFM into “a-new”:
1 4 0 0 Ç 7 An STORED 1400.
3. Enter current RPM into “b” old:
7 5 0 Ç 5 B STORED 750.
4. Calculate new RPM or “b-new”:
Ç R RPMn FAN LAW1 840.
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