Whats the capacity for air flow?
Fan exhaust capacity is rated in liters per second (L/s) or cubic feet per minute (cfm). A standard 5 x 8 bathroom needs a good-quality fan that draws a minimum of 50 cfm. Larger master baths may require stronger fans to efficiently pull the humid air from the room. To calculate the size of fan needed, use this equation: Multiply the total cubic feet of the bathroom buy 8. Then divide that number by 60, and you’ll get the required cfm. This equation is based on recommendations from The Department of Energy’s Energy Efficiency and Renewable Energy (EERE) program. Is the exhaust fan equipped with an electronic timer? In general, bath exhaust fans should stay on for one hour after baths or showers to effectively remove excess moisture from the room. Bathroom fans connected to light switches or exhaust fans that have a simple “on/off” switch normally won’t run as long as that because the homeowner doesn’t think about the real function of the fan. Also, homeowners may not remain at home lon
