Removing the bathroom vent fan housing will involve removing a few screws and possibly some metal clips. You can read our full article on how to install a bathroom fan without attic access here. The old bathroom vent fan will need to be disconnected from the wire nuts and unplugged. Replacing an exhaust fan involves removing the old exhaust fan from the ceiling. RELATED: Check Out ALL Our Articles On Bathroom Fans Here! For a bathroom above 100 square feet, industry associations recommend adding up the CFM based on the number of fixtures: For bathrooms less than 50 square feet, then a minimum 50-cfm bathroom fan is recommended. If you have a bathroom in between 50-100 square feet, you can simply add one CFM for every square foot of your bathroom space. The general recommendation for CFM is based on the size of your bathroom and the number of bathroom fixtures. Anything above 200-250 is usually for commercial properties. Residential bath fans usually range from the 50-cfm and all the way up to 180-cfm. I invite you to read our full guide on CFM sizing bathroom fans here. Bathroom fan strength or speed is rated in CFMs, which stands for cubic feet per minute. This is a measurement of how much air the bath fan can exhaust in one minute. The amount of CFM for the bathroom vent fan will depend on the size of your bathroom as well as the number of fixtures. What To Know Before Buying CFM or Fan Speed The WhisperFit requires a 4-inch duct for the advertised performance but a 3-inch duct adapter is included.ĭimensions: 10.25"W x 10.25"L x 5.625"D | CFM: 50-80-110 | Sones: 0.3 at 50-cfm | Duct: 4" or 3" | Joists: Fits 2"圆" or smaller ![]() ![]() The bracket can be expanded or contracted to fit 16" to 24" joist spacings. The installation bracket is retractable which means it can fold in half lengthwise so it will fit inside the ceiling hole. Panasonic also provides a Flex-Z Fast installation bracket to make the install even easier. It even has a plastic clip that will hold the bath fan in place while you screw it to the joists (and won't fall down). It was designed for retrofit installs (not just new construction) since it has a low profile (5-5/8″ housing depth) and will fit 2"圆" ceiling joists. Panasonic has made the WhisperFit super easy to install. The WhisperFit with LED light model is also my top pick for the best bathroom exhaust fan with LED light since it comes with a 10-watt light and 1-watt night light. And if it is 100+ square feet, choose the highest speed setting of 110-cfm. If the bathroom is around 80 square feet, then pick 80-cfm. If the bathroom is around 50 square feet, then choose 50-cfm. Bathroom SizeĪnd since there is a fan speed switch, this bath fan is perfect for small, medium, or large bathrooms. But even at the higher CFM fan speed, the WhisperFit is extraordinarily quiet due to it's variable speed motor. ![]() There is a little switch on the housing so homeowners can pick between 50-cfm (lowest noise), 80-cfm, or 110-cfm. The actual noise level and Sone rating will vary depending on which fan speed you choose. Our choice for the best quiet bathroom exhaust fan goes to the Panasonic WhisperFit because it is extremely quiet and rated at less than 0.3 sones on the 50-cfm fan speed.
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