I just redid my bathroom. The exhaust fan is new and a good model but doesn't seem to be moving steam. When I'm done showering the walls are wet and my shower rod and decorative fixture are rusting. I have the fan venting through a gutter soffit outside. I am not sure what to do besides taking the duct off the fan and letting it vent into the attic for now to see if it vents more steam. Any suggestions?