Bathroom Exhaust FanOne of the most damaging problems in a bathroom can be the buildup of excess of moisture. It’s normal. A hot shower or bath generates high levels of humidity and moisture. With the high levels of humidity come the bad things like mold, mildew, and other microorganisms that can be bad for your overall health.  New homes as well as newly remodeled bathrooms are susceptible to this buildup of moisture because new homes and newly remodeled bathrooms tend to be more energy efficient. Highly insulated and air tight bathrooms need to be ventilated properly and effectively. It is important for good bathroom air quality and the longevity of your bathroom.

What does a bathroom exhaust fan do? A properly sized and installed fan will draw out the highly humid air from the bathroom via duct work to the exterior of your home therefore improving and removing harmful humidity levels in the bathroom. It is important that the proper bathroom exhaust fan be selected to properly remove the moisture from your bathroom. Exhaust fans are rated on air movement capacity which is measured in cubic feet per minute (CFM). A good rule of thumb for air exchange rates is eight air changes per hour. It can be figured out to be one CFM per square foot of bathroom space. An example would be if you had a 10’x 8’ bathroom area the minimum fan required would be an 80 CFM exhaust fan.

Placement of the fan is also very important, fans approved for wet areas such as showers or tubs should be located over in very close proximity to the shower or tub. Some bathrooms may require more than one bathroom exhaust fan. Note that an enclosed toilet area should have its own exhaust fan. If you are unsure of placement or the type of fan required, you should consult your bathroom contractor for help in selecting the right exhaust fan and number needed for your bathroom.

Fan features can vary from model to model with noise levels being one of the most important. Bathroom fans are rated in sones. For a quiet bathroom, ventilation fan should be rated at 1.0 sones or less. Other features of bathroom fans can include features such as lights, heating elements, timers and even humidistat for automatic operation based on the level of humidity in the bathroom.

Increase the lifespan of your bathroom. Be smart and chose the right number and properly sized bathroom exhaust fan for your bathroom remodeling project.


For over 30 years, Realty Resurrections (MarylandBathroom.com) has continuously created a vast array of bathroom remodeling possibilities.  In the process, we’ve become a recognized leader in our trade. If have a bathroom project that you are considering and need an estimate please feel free to contact us 301-515-7130.