Calculated Industries 4090 - Fan Law 3

POCKET REFERENCE GUIDE — 23
Fan Law 2
A fan is producing 15,300 CFM at 3.2” SP.
If the fan is adjusted to 14,000 CFM, what
will the new SP be?
KEYSTROKE DISPLAY
o o 0.
1. Enter current CFM into “a” old:
1 5 3 0 0 Ç 4
A STORED 15300.
2. Enter new CFM into “a-new”:
1 4 0 0 0 Ç 7
A
n STORED 14000.
3. Enter current SP into “b” old:
3 • 2 Ç 5 B STORED 3.2
4. Calculate new SP or “b-new”:
Ç r SPn FAN LAW2 2.679311