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Mold & Mildew

Posted by Dan on April 20th, 1998 12:18 AM
In reply to Mildew and or mold by Dan Henize on April 19th, 1998 07:24 PM [Go to top of thread]

Dan, the thing to know about M&M is that it grows
when the reletive humidity at a surface reaches 70%.
As air is chilled by contact with the walls the
reletive humidity increases. Whether the humidity at
the wall reaches 70% is a function of the ambient
humidity and the wall temperature. A psychrometric
chart will tell you what the reletive humidity must
be to stay below 70% if the wall temperature is

Circulating the air in the room won't change the
humidity level. Exhausting air will just cause
replacement air to be drawn from somewhere; and if
you cause depressurization it will increase the
amount of water that migrates in from the walls (if
that is a source, and it probably is).

There are really only two choices, raise the
temperature of the surfaces or lower the reletive
humidity of the air. Since you want the room cold
that just leaves lowering the humidity. Whether you
can do this by ventilating depends on the temperature
and humidity of the air you exchange with. A
dehumidifier is another possibility.

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