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Fan static pressure

Fan static pressure

Fan static pressure

(OP)
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.

RE: Fan static pressure

rather than reverse engineer the existing fan performance, is it not better to examine what the required capacity is from an engineering perspective? maybe the old fans were over-sized?

RE: Fan static pressure

(OP)
@Lukai, Thanks for your input. I agree but I have limited resources to investigate the whole building and I got the assurance that ventilation system is ok meets the building requirement. That's why I came up with that simplistic solutions.

RE: Fan static pressure

what lukai said.

you could measure static pressure and flow to select new fan.

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