I have to replace several fans that were installed in the 70s. I don't have any cat sheet or drawings to verify their performance and data, manufacturer closed shop. I know their CFM and actual Hp. I figured out that in order to verify the static pressures of each fan, I have to plot the CFM and horsepower on the curve and take the reading on the Y axis for the static pressures, at this point, I am still plotting it at sea level and .075 air density its a kind of reverse engineering. Is these an accepted procedure? another caveat. this is located around 7000ft. above seal level. when will I include the correction factor? in this case, it is 1.15. Do I have to multiply the CFM with the correction factor before plotting it?
Thank you for all the help.
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