A Simple Guide On Bathroom Exhaust Fans!

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You already know how essential exhaust fans are for your home, and it’s even more important for your bathroom than any other room. However, simply having the best exhaust fans with humidity sensors won’t cut it. 


You have to think about where you place them to remove moisture and ensure proper airflow effectively. Whenever you install an exhaust fan in the bathroom, you should ensure it’s near the shower but not directly over it. 


Now, there are shower-rated exhaust fans out there that can be placed on the ceiling near the shower but never directly over it. There are a few different factors that you have to take into account when installing an exhaust fan. 


At Electric Supply Depot, we specialize in providing homeowners with the best exhaust fans in the market, so we know how to ensure you get the best out of your exhaust fans. In the following passages, you will find a simple guide on bathroom exhaust fans that will help you a lot when installing one in your bathroom. So without further delay, let’s check them out!

Bathroom Exhaust Fan Guide!


Placing The Exhaust Fan Near The Shower


An exhaust fan will exhaust moist air out regardless of where it’s placed but if you want maximum output, then putting it near the shower is your best option. When you place the fan near the shower, the steam will be quickly exhausted from the house, and fresh air will be drawn in from the gap under the door. 


In addition, when you correctly place the exhaust fan, you will keep the shower corner considerably warmer. It also makes the bathroom ideal to use a light/fan combo to keep it as minimalist as possible. Remember, when you place the fans near the shower, it will provide efficient ventilation while ensuring maximum comfort. 


Placing The Exhaust Fan Directly Above The Shower


While you will find many people recommend placing the exhaust fan directly above the shower and theoretically, it should make the fan more efficient. However, there is no measurable difference in the speed at which moisture is exhausted compared to when placing the fan near the shower. 


However, since part of the job of an exhaust fan is to bring in cold air from outside, it can end up giving you chills when showering, and imagine how worse it will be during winter. You wouldn’t want a cold draft blowing past you when showering during winter, would you? 


So you see, there’s no upside to placing the bath fan in the shower, and all you get is a chance that there will be a cold draft, and that’s why we usually don’t recommend placing the exhaust fan directly over the shower. Instead, we suggest you place it away from the shower, ensuring it’s placed between the door and the shower.


Placing The Exhaust Fan In An Enclosed Shower


There isn’t any risk of catching a cold draft in an enclosed shower because everything has to come through under the shower stall door or through small cracks. That slows down the air movement and won’t cause a noticeable draft. 


However, it’s not a good idea to place an exhaust fan inside the shower stall/cubicle. Why? Well, it’s the same reason why there’s no cold draft. When you place the exhaust in an enclosed place, you are basically stopping the fan from efficiently moving air. 


So unless you have an enclosed shower with a large gap under the door, there is no way for you to use an exhaust fan efficiently. Also, some municipalities require you to install a second exhaust fan in the bathroom if you install one in an enclosed shower. 


Avoiding Obstructions


If you want efficient airflow in your bathroom, you have to ensure there aren’t any towel racks, drawers, or other furniture/appliances between the shower/bath and the bathroom fan. Keep in mind that the airflow will be hampered if you put the exhaust fan behind a large cabinet. The good thing is that there’s plenty of options for you to implement a solution that provides no visible dust-filled bath fan grille and efficient ventilation.


Ceiling Mounted Exhaust Fans


You will find around three different exhaust fans, but the most efficient type is the fan you can have in your bathroom. That is because the steam from the shower moves up and will naturally move into the fan. While installing one on the wall is good enough, you will see much more efficient ventilation if you install one on the ceiling. 


If you want the best possible result, you have to make sure that the moist air is exhausted as fast as possible to prevent it from condensing on cold surfaces. Doing this will decrease the time it takes for the bathroom to dry after taking a shower. 


Now to get the best out of your bathroom exhaust fans, you can use a CFM calculator to find out the optimal airflow for your bathroom. Make sure you choose the right size of exhaust fans because it’s vital for keeping your bathroom mold-free and keeping the mirror from fogging up.


Find Out Where Fresh Air Is Coming From


Even if you have the best exhaust fan with a humidity sensor, it won’t work perfectly if there’s no source of fresh air available. For it to work perfectly, there has to be a gap for air to enter the bathroom. If your bathroom doesn’t have an outlet to bring in the fresh air, then don’t worry. It’s pretty easy to trim it down. 


But don’t rush in and cut down your bathroom door right away; make sure you check if it is necessary. You should install the fan and turn it up to see if fresh air is coming in and then decide on creating a spot for air to come in. 


To check the bathroom, you can open the door half an inch, and if you see that the airflow tries to close the door, then there isn’t sufficient makeup air available. If your bathroom is soundproof, you have to make sure there’s an additional makeup air vent. Ideally, the air should come from another room and not directly from the outside to prevent cold drafts. 


Checking The Attic For Obstructions


Whenever you are thinking about installing an exhaust fan, make sure to check the attic and see if there’s sufficient space where you are planning on installing the fan. Try not to install it too close to the soffit because there may not be enough room to move around and connect the duct to fasten the fan to the joists. 


Along with that, you should also find out how to run the duct and where to terminate it. Also, you can remove it either through the roof or through the soffit. If you don’t have previous experience roofing, we recommend going through the soffit. That way, there’s no risk for future water damage from the leaking roof vent hood.


Other Considerations To Take Into Account


Placement isn’t everything when it comes to installing an exhaust fan in your bathroom. There are a few different factors that you should take into account. Here are the most important ones:


Duct Size


Duct size is crucial when thinking about installing an exhaust fan. Remember, an undersized duct will make the fan much louder and reduce its capacity to move air. Ideally, you should at least use the same size duct on the bath fan housing connector. However, if it’s longer than 20 ft, consider going up one size.


Duct Type


For the ducts, you should use rigid metal or PVC ducts. However, if the duct is short, you can consider a flex duct.


Duct Routing


Whenever you route the duct, make sure you find the shortest and straightest path from the fan to the termination point. With fewer turns and shorter ducts, the entire system will be more efficient. 


Duct Insulation


Insulation is another crucial element when installing exhaust fans in the bathroom because you don’t want water to drip back into the bathroom and cause brown stains around the fans. Also, make sure to place insulation above the fan housing for maximum impact.


Fan Capacity


When choosing an exhaust fan, you should always consider the fan’s capacity to ensure you get the suitable ventilation needed for your bathroom. You can use a CFM calculator to find out the power you need for your bathroom and ensure proper airflow to dry the bathroom promptly.


Importance Of Venting Outdoors


Since the primary purpose of using an exhaust fan is to ensure a mold-free environment, venting it to the attic can be counterproductive. If you don’t have an exhaust fan in the bathroom to draw out the moisture, then you’ll see mold growth. 


However, the mold and mildew can grow for years without anyone noticing if the moist air is exhausted to the attic or any other hidden space. So we recommend you put the exhaust air outdoors.


The Best Place To Buy Exhaust Fans


So there you go, that concludes our guide on bathroom exhaust fans. As you can see, there are quite a few things to consider when installing an exhaust fan in your bathroom, regardless of whether or not it comes with a humidity sensor. 


So now that you know everything else about installing fans, you are ready to find the best ones for your home. To find the best exhaust fans, you need to find the right place, and that’s where Electric Supply Depot comes in. We specialize in providing high-quality home electrical supplies like exhaust fans to homeowners from all over the US. 


So if you are looking to buy the best exhaust fans, contact us, and we will hook you up! Also, if you have any questions regarding fans or other electric equipment, drop them 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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