![]() This will depend on the model but usually flipping the wall switch on ONCE will turn on the bath fan manually (regular mode). The most common way to turn the bath fan on is by toggling the wall switch. And when it drops below the preset level, the fan will turn off. ![]() When the moisture rises to the preset level, the fan will turn on. The factory set point will usually be around 50% relative humidity but it is adjustable on some fans. Humidity sensing fans turn on when someone uses the shower or bath and the humidity rises. How Do Bathroom Fans With Humidity Sensors Work? Read Also > What Are The Best Humidity Sensing Exhaust Fans With Lights? The 'leaving it on after' part is important so the bath fan can properly remove all of the moisture which takes several minutes (depending on the fan). In an ideal world, people would turn on the bathroom fan when taking a shower or bath - and leave it on for 15-minutes afterwards. Once the humidity reaches a particular level (such as 55% relative humidity) it activates a switch to turn on the bathroom fan automatically. Broan-NuTone QTXE110S (Best Controls Extractor Fan With Auto Sensor)Ī humidity sensing bathroom vent fan has a built-in sensor (humidistat) that responds to moisture in the air when taking a shower or bath.Delta BreezSignature VFB25AEH 130-CFM (Best Budget Humidity Sensing Bathroom Fan).Broan-NuTone Roomside AER110SLW 110-CFM (Best Exhaust Fan With Light, Humidity Sensor, and Timer).Delta BreezSlim SLM70H 70-CFM (Best Humidity Sensing Exhaust Fan For Small Bathrooms).Homewerks 7136-02HW 140-CFM (Best Fan With Automatic Humidity Control For Large Bathrooms). ![]()
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