Invest in a fan with a timer switch. Your fan should actually run up to 15 minutes after you’ve stepped out of the shower. This helps reduce condensation and will prevent your ceiling paint from bubbling (and spores of mold from growing). This is a code requirement if you don’t have a window in your bathroom, but even if there is a window, a high-quality vent is still a good idea. If your new bathroom fan is less than $75, it likely does very little, so I recommend budgeting $250 or more. Remember that the larger the square footage, the more CFM (Cubic Feet per Minute — of air exchange). Opt for a fan with more than 150 CFM’s to really notice a difference and preserve your newly renovated space.

Source Article