Calculated Industries 4090 - Velocity Pressure;FPM Keys

POCKET REFERENCE GUIDE — 7
Offset Keys
Ç ( Calculates offset measure-
ments including: center-
line radius, wrapper
length/stretch-out, heel
radius, throat radius and
theta, given below entries
R Enters the actual length “x”
r Enters the offset “y”
Ç 4 Enters length of “end a”
Fan Law Keys
Ç R
Fan Law 1 — Calculates
the missing variable (e.g.,
“a-new” or “b-new”, for
CFM new or RPM new) for
Fan Law 1, given the three
known variables into the
applicable Storage
Registers below
Ç r
Fan Law 2 — Calculates
the missing variable (e.g.,
“a-new” or “b-new”, for
CFM new or SP new) for
Fan Law 2