Among the major blade vendors, Cisco appeared to have taken the lead by offering support for the broadest operating humidity range, but Sun appears to have matched Cisco recently:
- Cisco's Unified Computing System blades support 5 to 93% RH
- Sun's Sun Fire X2270 blades support "up to" 93% RH
- HP's c-Class BL260 G5 blades support 10 to 85% RH
- IBM's BladeCenter HS22 blades support 8 to 80% RH
- Dell's PowerEdge M600 blades support 8 to 80% RH
(All humidity ranges are non-condensing. All data is from vendor web sites as of 9/3/09).
Ever-widening ranges for supported humidity make the use of dry-side economizers more feasible. If vendors were able to support 0-100% relative humidity, data center operators wouldn't need to worry about humidifcation/de-humidification controls. Eliminating such controls and systems could lower capital costs, reduce operating costs, lower the carbon footprint of facilities, and lower their water footprint as well.