Easy Guide To Installing An Exhaust Fan With Humidity Sensor!

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If you are tired of seeing the walls and other bathroom surfaces covered with condensation when stepping out, then you are not the only one. As time goes on, the moisture and humidity can make paint begin to peel, cabinets and doors can warp, and even mold can start prospering in corners. 


Now, the best way to combat this is to install an exhaust fan in the bathroom. You can install one with a light and heater along with a humidity sensor. At Electric Supply Depot, we specialize in providing high-quality electric supplies to the citizens of the US to keep their homes in tip-top shape. 


So we know all there is to know about exhaust fans and all that comes with them, and we thought we should let you know how to install an exhaust fan easily. In the following, you will find an easy guide to installing exhaust fans with humidity sensors. So without further ado, let's check them out!


Marking The Fan Location


The first thing you should do when installing an exhaust fan is to mark down where the fan will be placed. Many exhaust fan models double as a ceiling fixture but won't require removing your existing ceiling light fixture. 


It usually is adjacent to the current fixture as it will need to draw power from the fixture's wiring. If you are unsure about the ceiling joists, you can use a stud finder to determine and then mark the location. 


The exhaust fan needs to be anchored between two joists, so they support the fan's weight. Next, make sure to trace the dimensions of the fan unit on the ceiling with a pencil. The good thing is that some models come packaged with a template for marking the unit's outline.

How To Install A Home Exhaust Fans!


Cutting Into The Ceiling


The second step in installing an exhaust fan is to cut a hole into the ceiling where the fan will be placed. But before you do that, you should turn off the power to the bathroom at the main electrical panel. If you aren't sure where the bathroom power comes from, you may need to turn off the power in your house to ensure your safety.


That's because you shouldn't be making blind cuts into the ceiling, not knowing if there is an electrical wire or other essential structures located there. So instead, start by using a drill to make starter holes in each corner of the marked outline, then use a drywall saw to cut the hole for the unit in the ceiling.


Installing The Ventilation Duct


You have to make sure that the fan vents out the air and the moisture outside. So you will need to install a ventilation duct that connects the exhaust fan to a vent opening that you will make in the exterior wall. 


Exhaust fans are usually vented through a roof soffit vent or a roof vent. But if it's not feasible due to the location, then cutting a hole through the exterior wall specifically for venting the fan's exhaust is the next best option to vent the air and moisture outside. 


Start by measuring the outlet on the exhaust fan. If you have a fan kit that doesn't include everything, you will need the measurements to buy all the necessary aluminum hosing to create your vent duct. 


You'll also need the measurements to know the size of the vent opening you will be cutting in the exterior wall. The average diameter of the hose is around 4 inches, and you may find the correct dimensions outlined in the manufacturer's instructions. 


Look in the hole and locate the closest outside wall. Then maneuver the hose into the ceiling hole until the other end is against the outside wall. You can use a flashlight to guide you. 


You should then go outside on the other side of the bathroom wall and measure the same height up from the floor in the bathroom to the ceiling. To that, you should add 3" vertically and mark the location. This is the location where you will be cutting into the wall, making a hole by using the mark as the center of the hole, and then using a combination of a drill and reciprocating saw or use a 4" hole saw to create the opening. 


When you are finished with the hole, reach in and grab the hose and pull it through the hole a few inches. Make sure to slide the hose over the stub of the vent wall cap and secure it with a metal clamp. 


After that, you should push the hose back into the hole, then attach the wall cap to the exterior wall with the supplied screws and a drill. The next step would be to use exterior silicone caulk with a caulking gun around the cap's outer edge to create an airtight seal. 


You will find how long you have to let it dry in the manufacturer's instruction. Then fasten the exhaust vent cover as directed in the vent instructions. The next step in this process is to go back inside and ensure that the hose is lying flat against the ceiling inside, then trim off any excess hose with a utility knife. 


Making The Electrical Connections


When connecting the exhaust fan, you will need to find out which circuit to use to provide power to the fan. The easiest option is to take power from any available light fixture or outlet, which most likely will be your ceiling light fixture. 


You should remember to add a switch to turn the fan on unless you want it to turn on every time you switch on the lights. To do that, you will need to run a 3-wire cable between your new exhaust fan and the existing switch, then remove the old switch and replace it with a double switch at that electrical box. 


After that, you will need to connect exhaust fan wiring to the existing ceiling fixture wiring. The process requires you to take a new piece of 12-2 electrical wire and join one end of it to the black and white wires of the fan unit by twisting the ends of each wire together. 


It would be best if you used needle-nose pliers to twist wire ends together for the best connection. Make sure to connect the ground wires if there is one and then fasten the wire connections securely by twisting on wire connectors. Once you are done with that, you should connect the black and white wires at the other end of the cable to the corresponding wires on the light fixture.


Securing The Exhaust Fan


This is the last step in the installation process. You should push all wiring into the hole. Follow the instructions provided in the manual and attach the unit to the joists in the ceiling using the supplied hardware and a screwdriver. Snap the cover into place, and you are done!


The Best Place To Buy Exhaust Fans


So there you go now you know how to install exhaust fans in your bathroom, whether they come with light, heater, or humidity sensors. As you can see, the guide is so simple that anyone without prior experience can do it. 


However, knowing how to install an exhaust fan is only half the battle. You also need to find the best exhaust fans for your home, and that's where Electric Supply Depot can help. Our curated list of electric goods and products are the best on the market and offers you the best value for your money. 


So feel free to get in touch for your bathroom exhaust fan, and we will hook you up. Also, drop any other questions you may have regarding installing an exhaust fan in the comments below or hit us up on our socials, and we will answer them all for you. And with that being said, that's about all we have for you today. We will come back with something new for you soon. Until then, see ya!

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