![]() ![]() Quieter fans cost more, but you may decide that the reduced noise is worth the higher price. If you have a large bathroom (600 cubic feet or more) or one with a jetted tub, it’s best to bump up fan size by 50 CFM. 13, you get 65, so you would round up and buy a 70 CFM bathroom fan. For example, a 7-by-9-foot bathroom with an 8-foot ceiling equals 504 cubic feet. To determine the target CFM, multiply the total cubic feet by. To calculate the size that will meet your needs, multiply the bathroom’s length, width, and height to arrive at total cubic feet. One that’s too big could, in some instances, contribute to a dangerous negative air pressure situation that could pull deadly carbon monoxide back through the flue of a furnace or water heater. A fan that’s too small won’t remove enough odor or moisture, leaving your bathroom subject to mold, mildew, and peeling paint. It’s important to choose the proper fan size from this wide range. Select the Right Size and Style of Fanīathroom fans come in several sizes, from small units that exhaust just 50 cubic feet of air per minute (CFM) to larger units that remove almost 200 CFM. These fans are typically much larger than ceiling- or wall-mounted fans because they need to be powerful enough to provide adequate ventilation to multiple bathrooms. The actual fan, however, isn’t installed in the bathrooms but rather in a remote location, such as an attic.
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