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krw

In article ,
says...
On 12 Nov 2006 08:31:22 GMT, (Andrew
Gabriel) wrote:

official IBM spec for a data center was 75F at 50%RH.

In most places I've been, the rooms run at 21C (70F).
The RH is then adjusted to stop the room feeling too cold to
humans in cases where they have to work in there for long
periods. (A dry 21C with significant wind chill feels very
much colder than 21C.)

Maintaining RH at 50% is mostly to make the paper (cards in the olden
days) more machine friendly. At lower RH static is a problem and at
higher RH the paper stiffness suffers and it swells imparing feeding.

Not true at all. A high RH contributes to failures in electronics
as well. Even recent equipment is specified from 40-60% RH, over a
fairly narrow temperature range.

--
Keith