Guidelines from ASHRAE and Manufacturers Recommended range: 18 °C to 27 °C (64. A1 class equipment, which includes most enterprise servers and storage hardware, has the strictest temperature and humidity requirements. Special thanks also to Dave Kelley (Emerson), Paul Artman (Lenovo), John Groenewold (Chase), William Brodsky (IBM). While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy. The formula for Relative Humidity (RH) is: RH= (Actual Water Vapour Density÷Saturated Water Vapour Density)×100 Where Actual Water Vapour Density is the amount of water vapour in the air, and Saturated Water Vapour Density is the maximum amount the air can hold at a given temperature.
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