What would you say most people want in their bathroom? A Jacuzzi tub, large walk in shower or perhaps a double sink? The answer might surprise you.

According to a report from the National Association of Home Builders, an exhaust fan is the number one feature home buyers are looking for in a bathroom.

An exhaust fan does more than just help eliminate annoying fog on the bathroom mirror.  Other benefits include slowing fixture rust, preventing door and window warping as well as retarding paint blister and wallpaper peel.  However, many bathrooms have fans that are undersized.  So, if your bathroom mirror is fogging up when showering, chances are you may need more ventilation in your bathroom.

Ventilation rates are based on eight air changes in an hour. Air movement is measured in cubic feet per minute (CFM). For most bathrooms this works out to one CFM per square foot of bathroom area.  For example, a 7ft x 10ft bathroom would require a 70 CFM fan.

Exhaust fans are also measured in Sones which measure the sound the fan makes. Typically, from 0.5 (almost silent) to 4.0 (normal television sound). 4.0 may be loud for a fan but it does provide privacy against toilet sounds especially in powder rooms which are generally located in public areas of a home.

Here is a bathroom fan calculator link to see if your exhaust fan is adequate for your bathroom: