"Normal" shld stand for standard atmospheric value. The HP being a function of the air density, the Power have to be converted to the reference to be absolutely rigorous.
Note that standards varies (and still does) from one country to another.
ISO being 0°C and 1013mbar - CFM around 15°C etc..
Note also that if this is the case, there might be some error in the the conversion.
Last edited by TomcatViP; 09-19-2012 at 08:40 PM.
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