Re: Humidity ranges?

[Jeff Kell]

Todd Mitchell - lists wrote:

| and when I should
| complain to the datacenter operators? (References I can point to would
| be nice.)
When your equipment starts to rust ;)

I don't have any technical references, but I think that anything over
65% is probably too much.  Most facilities I have equipment in do not
exceed that mark.
It isn't a *huge* issue (within reason) unless you have printers around 
and the inherent paper.  Big lasers are notoriously finicky about 
humidity, which directly affects the paper quality.

Otherwise, just keep it well below the dewpoint :-)

Jeff

Re: Humidity ranges?

[Marshall Eubanks]

On Mon, 04 Aug 2003 23:35:24 -0400
 Jeff Kell <[EMAIL PROTECTED]> wrote:
> 
> Todd Mitchell - lists wrote:
> 
> > | and when I should
> > | complain to the datacenter operators? (References I can point to would
> > | be nice.)
> > 
> > When your equipment starts to rust ;)
> > 
> > I don't have any technical references, but I think that anything over
> > 65% is probably too much.  Most facilities I have equipment in do not
> > exceed that mark.
> 
> It isn't a *huge* issue (within reason) unless you have printers around 
> and the inherent paper.  Big lasers are notoriously finicky about 
> humidity, which directly affects the paper quality.
> 

If you are running lots of mag tape, humidity > 60 % starts to really
increase tape and head wear. If new tape heads are part of your
regular operating budget, I would keep the humidity < 50 %.

Regards
Marshall Eubanks

> Otherwise, just keep it well below the dewpoint :-)
> 
> Jeff
> 

Re: Humidity ranges?

[Richard Parker]

For a datacenter with a single controlled area the ideal range for relative
humidity (RH) is in the neighborhood of 35% to 50%.

Here are some data points:

  1)  Static electricity is minimized when RH is at or above 35%.

  2)  RH below 25% can cause embrittlement of hygroscopic materials
  such as paper.

  3)  RH above 65% can cause mold growth and metal corrosion.

  4)  Humans are most comfortable when the RH is between 20% and 60%.

  5)  RH above 50% in cold weather can cause condensation inside of
  outer walls (or on equipment itself if the facility has an
  external door or window that opens directly into the controlled
  area).  

Sean Donelan wrote an informative post on a related subject a few year back:

  

-Richard

Re: Humidity ranges?

[Frank Louwers]

On Mon, Aug 04, 2003 at 01:02:46PM -0700, Steve Francis wrote:
> And reasonable thresholds that I can tolerate, and when I should 
> complain to the datacenter operators? (References I can point to would 
> be nice.)

depends what's in your SLA. If it states 40-65%, and you notice it's
over 68% or so, you SHOULD complain. Otherwise, you "agree" to the
higher %, if they can prove you know about the higher %. (IANAL)...

Of course, there's a difference between complaining, and demanding
refund. However, I think it's wise to complain...


Kind Regards,
Frank Louwers

-- 
Openminds bvbawww.openminds.be
Tweebruggenstraat 16  -  9000 Gent  -  Belgium

RE: Humidity ranges?

[N. Richard Solis]

 IIRC, too low a humidity level makes static electricity a problem.  Too high makes 
the cold air condense on your equipment.  60-65% sounds about right.


 
Todd Mitchell - lists wrote:
 
>
> | and when I should
> | complain to the datacenter operators? (References I can point to would
> | be nice.)
>
> When your equipment starts to rust ;)
>
> I don't have any technical references, but I think that anything over
> 65% is probably too much.  Most facilities I have equipment in do not
> exceed that mark.
>
> Todd
>
> --  
>
>
>

RE: Humidity ranges?

[Todd Mitchell - lists]

| and when I should
| complain to the datacenter operators? (References I can point to would
| be nice.)

When your equipment starts to rust ;)

I don't have any technical references, but I think that anything over
65% is probably too much.  Most facilities I have equipment in do not
exceed that mark.

Todd

--