You probably need to install a bathroom vent fan.  Like a fireplace without a chimney, in a bathroom without a vent fan, moisture will seep into the walls and grow mold and mildew, or blister paint and peel wallpaper.

Bathroom vent fans are rated by how many cubic feet of air they can move in one minute, know as the CFM rating.  To determine which size fan to buy for your bathroom, multiply the room's square footage by 1.1.  For example, a 100-square-foot bath would require a 110 CFM rated fan.  Fans also have a sound rating, measured in sones.  Vent fans range from as low as .05 sone up to about 6.0 sones.  The CFM and sone ratings are printed on the vent fan box.

We install bathroom vent fans through an outside wall rather than the roof.

First, roof vents are always a potentail leak waiting to happen; anytime you cut through the roof, there's a chance of a leak later on from not maintaining the seal or condensed steam dripping back into the fan and rusting it.  The seal should be inspected every spring and fall to prevent leaks.  Secondly, a heavy snowfall or ice might block the vent flap making the fan nonfunctional.  Thirdly, installing a vent through a side wall, requires less materials and less labour, which means its more economical. 

By investing the money required to have a bathroom vent installed, you will actually be saving yourself time and money in the long run.  The damage that may be caused by mold and mildew can be quite costly to repair.  So your exhaust fan will help protect the already large investment that your have made in your home.

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