Bathroom ceiling fans are called intermittent ventilation and are used to capture and remove pollutants quickly at the source. The purpose is to exhaust excessive moisture or pollutants before they can spread to other parts of the house. Areas requiring this type of ventilation are bathrooms, kitchens, utility rooms, exercise rooms, workshops, garages and home offices.
Q. What size bathroom exhaust fan will I need?
A. For bathrooms up to 100 square feet in area, it is recommended that an exhaust fan provide 1 cfm per square foot at approximately eight air changes per hour. For proper ventilation, the fan should be left on for around 20 minutes after usage; you may want to install an automatic timer.
For an 8'x5' room with an 8' ceiling = 40 sq ft, you will need a fan rated at 40cfm. For larger bathrooms install a 150cfm fan so that the air can be pulled through the entire room and exhausted at a central location. Or, you can install multi fans; one over the toilet, in the shower, and over the tub. This second method is very effective and provides ventilation where and when it's needed, but both methods work well.
Q. Where should I install the fan?
A. Typically the exhaust points should be located over or near the shower or tub and in an enclosed water closet.
Q. If mirrors stay steamed up or the grill is dripping water, is the fan(s) operating correctly?
A. You could try leaving the bathroom fan on longer to carry out more moisture, or check the design of the duct work. Poor design or damage may prevent the fan from moving the moisture out. You can insulate the ducts and check the roof jack which may be allowing rain to come into the duct, or it could be that condensation from warm, humid air in the house is striking the cold duct surface.
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| Ultra-thin window mounted ventilation fan |
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