Evans is an engineer with APC in West Kingston, RI. He has 14 years of experience in power and cooling system design and is a member of ASHRAE Technical Committee 9.9 (Mission Critical Facilities, Technology Spaces, & Electronic Equipment).
Controlling humidity in IT environments is essential to achieving high availability. This article explains how humidity affects equipment, and why humidity control is required. The author offers quantitative design guidelines for existing and new computing installations, and he also explains the hidden costs associ-ated with over-humidification.