In this tutorial, we learn how to install a bath fan. When you take a shower and don't have a bath fan, you are more likely to have mold or mildew in your bathroom. First, you need to determine the correct CFM for your bathroom, then you need to find a fan that is as loud or quiet as you want it to be. Choose if you want a quiet or loud one. After this, you will need to find out where to put the bath fan or check your current one to see if a new fan will fit inside!