The power of an engine measured at the flywheel or output shaft at standard SAE conditions of 752. 1 mm Hg (29. 61 in. Hg) barometer at 25°C (77°F) inlet air temperature
NFPA 37 Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines, 2002 ed. http://pozhproekt.ru/nsis/nfpa/NFPA37-2002.pdf, (Std: Install and Use of Stnry Combustion Engines and Gas Turbines - Amer) {201 NFC}