We have a home that was built in 1920. We want to take an upstairs bedroom and turn it in to our master bathroom. There is a set of windows about 45 X 58. Our contractor says we do not need a fan in the room because of the windows. I told my husband we should do it anyway and vent it out the side of the house. We live in a four season area. So the question is, should we have the fan installed? I'm not one for opening the window in winter and the tub will be installed beneath the window. Thank you.
Great question. While it is correct that a bathroom with a window that allows for ventilation does not require fan, it's also correct that you probably won't want that window open in the winter. So yes, we would recommend a fan. However, it is absolutely crucial that the fan exhausts to the outside of the house. You can run a duct through the attic and then outside. You can also run the duct up through the roof or down through the soffit. Any duct must end outside Never allow the duct to exhaust into the attic, crawlspace or other enclosed area. This will only lead to moisture build up which will mak for perfect conditions for mold growth. Good luck with your project!