A how to read the
friction rate using the Duct Calculation Slide Rule!
Confusing the pressure drop with friction rate can lead to significant
errors. TT-102 shows you how to read friction charts used with the
Duct Calculation Slide Rule. 12 pp.
Topics include:
How to read the friction chart given any two of the four parameters
(CFM, friction rate, velocity, and duct size)
The difference between friction rate and pressure drop
How to convert pressure drop data into friction rate values
How to use friction rate values, velocity limits, and CFM requirements
to determine duct sizes
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