Calculated Industries 4090 - Manual (Page 107)

106 — ITI S
HEET
M
ETAL
/HVAC P
RO
Fan Law 1 Formula
Fan Law 2 Formula
Fan Law 3 Formula
After a Full Reset/Clear All, your calculator will return to the following
settings:
SETTING IMPERIAL
On-Center Spacing 16 Inches
Fractional Resolution 1/16
Area Display Standard
Volume Display Standard
Desired Riser Height 7-1/2 Inches
Desired Tread Width 10 inches
Stairway Headroom 6 Feet 8 Inches
Floor Thickness (Stairs) 10 Inches
Jack Rafters Descending
Irregular Jack Spacing OC-OC
Exponent On
Meter Linear Rounding 0.000
Degree Rounding Float
Mathematical Operations Order of Operations Method
APPENDIX F — DEFAULT SETTINGS
where,
BHP = Brake Horsepower
CFM = Feet
3 per Minute
S
S
where,
SP = Static Pressure
CFM = Feet
3 per Minute
where,
CFM = Feet 3 per Minute
RPM = Revolutions per Minute
APPENDIX E — FAN LAW FORMULAS