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This paper presents a simplified method for absolute determination of the perfornance correction for air density variations in a convenient ready to use form. It was developed through the use of computer analysis of data for 14 widely differing vacuum cleaner motors. By acknowledging that a 1-percent error in the vacuum correction factor was acceptable, a single curve was developed. A wattage correction factor curve was also developed. Because of the variance in efficiencies between motors, however, this curve has an error range of 4 5 percent. The curves were then verified experimentally by more than 1000 tests taken in environmental and altitude chambers in the ambient range from 50 to 100Â°F and 24 to 30 inches of mercury barometric pressure.