There are many advantages to installing a bathroom fan: (1) they provide convenient “white noise” when the bathroom is in use. (2) They improve the ventilation in the room, which helps with bad odor. (3) Most importantly, the ventilation helps combat mold and other damage caused by moisture, like peeling walls, etc. Now that you're sold on the notion, here is a guide about how to install a bathroom exhaust fan.
We recommend that you use the manufacturer’s installation instructions, but this guide can serve as a source for clarifying details of the install that you may not understand. There is a variety of bathroom fan options, so every install will vary to a certain degree, but they all share commonalities.
Before installing a fan you must get the wiring right. Make sure that your switch and cable is compatible with the unit. If there is an existing light fixture then the wiring is already in place and this process should be a breeze. For safety: (1) turn off power (2) lock circuit breaker box so nobody makes the mistake of flipping the switch back on (3) equip goggles and nose/mouth mask (4) consult the advice of a professional electrician who can tell you if your job requires a permit and to check for potential circuit overload.
Properly venting your bathroom fan will help avoid creating moisture problems in your home. If you can avoid the use of a roof vent then you have found the easy way out. A soffit is a termination you see coming out from underneath a roof overhang. In this case, you will need flexible ducting (probably plastic) to connect the bathroom exhaust fan to the soffit vent. In some cases, you will find bathroom fans that feed directly through the exterior wall with a hood and dampers. Every project is slightly different, so hopefully, this gives you the framework to complete the job no matter what components you have. Now that you know how to install a bathroom exhaust fan, you are ready to take on your project.
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