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M&Ms (not the good kind)

Posted by JT on May 18th, 1998 08:00 PM
In reply to Bathroom mold and mildew by Jay Dover on May 18th, 1998 01:45 PM [Go to top of thread]

Jay, the basic requirements for M&M is simple: moisture,
temperature, and spoors. Reletive humidity must be 70%
or more at a surface, temperature above about 40 oF,
and, of course spoors are always present. Keep in mind
that a surface that is cold (such as a poorly insulated
exterior wall) will have a higher reletive humidity
since the air that contacts it will be cooled and
thus able to hold less water.

The only controlable parameter here is moisture. You
probably need to install a bath fan. Figure 1 CFM per
sq. foot of floor space to get the recommended 8
air changes per hour (ACH). Don't vent it into the
attic. Get a good quality fan such as a Panasonic or
Fantech, they will be quiet enough to live with and
will actually move the amount of air they are rated at;
unlike the Home Depot variety. Check the pricing at and don't get suckered into paying

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