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Draw the border of the perimeter of the bathroom fan in the desired location. Create pilot holes in each corner with a drill and use a jigsaw to cut the shape of the fan out of the ceiling. Also, since these fans let the wet air directly at your wall, there is a risk of potential issues with water stains and mold.
So not only does this look ugly — but it can also lead to structural problems down the road. If this is not something that bothers you too much, this might be the ideal match of convenience and ease of setup for most people. For more information, check out our post on how to install a bathroom vent through a wall.
Soffit venting is a passive venting system. The outside air is meant to keep your home cool so you can already see how introducing the moist and hot air from your bathroom can be a cause for many problems and prevent this system from working properly.
Venting your bathroom fan through a soffit vent is far from ideal. It might interfere with your existing venting system and render it useless. That is why this option is not allowed everywhere. But if you have no other options at your disposal, a soffit vent installation will do.
If you pick this option, get unique soffit vents with spring-loaded covers. These are designed to snap shut once the air stops flowing to ensure that your soffit venting works properly and prevent birds and insects from getting inside your vents.
You can even install special fans with moisture sensors that turn on only when the moisture is too high in order to minimize airflow through the vents.
Even then, a home inspector can write you up if they notice that your bathroom exhaust fans are connected to the soffit vent, so this option is far from ideal. You have probably noticed that terminating your vent directly into your attic is not listed as a viable option.
This is because that is the worst thing you can do. When you vent the bathroom fan into an attic, you simply ask for moisture damage at your home. If that is not enough, consider all the health risks associated with living in a damp environment. Venting your fans to the attic comes with one more risk — the air that you expelled from your bathroom or your home as a whole can easily enter back inside. This defeats the purpose of a venting system while also making it easier for any contaminants from the air to re-enter your home.
Due to the reasons listed above, venting straight to the attic is prohibited nowadays. You might run into an older house that still has this system set up but keep in mind that it is not suitable for your home or health. Avoid this option if you can. The only exception to this rule is the extremely warm and humid climates where the risk of condensation happening in your attic is relatively low or nonexistent.
Even there this type of practice goes against the code but even some newer homes have this venting system in place. However, even if there are no risks of mold forming, other important concerns — such as potential hazards to your health — still remain. Even if you live somewhere warm and humid, do all you can to stay away from this option. For instance, you can get a humidity-sensing bathroom fan. Before inserting the fan into the hole make sure that you have properly cleaned the inside part of the hole so that you can easily see the attic through the hole.
You can use a powerful vacuum cleaner or just use a mop for this cleaning job. Now, go to the attic and connect a 4-inch wide and degree duct elbow with vent fan carrier or fan housing.
You will find a port there to connect it. After connecting it, you should secure the connecting with duct tape foil. To do that, get the fan out of its box and unfasten its wiring. Before fixing it into the hole, connect the fan with a power outlet and check if the fan is working properly or not.
Now, place the fan on the fan housing and set it exactly in the middle of the carrier. Take out the fan of the hole and connect the cable connection securely. After that insert the fan again and attach the given screw to secure the fan on that position firmly.
Staying inside the attic, choose a position in the middle part of the sidewall. Mark that position and make a small see-through hole on that spot.
Make sure that the hole is not too far from the fan. Use a ladder for secure climbing. Take the reciprocating saw and make a diamond-shaped hole in that position. This kind of hole is perfect for attaching round or square shape objects on the wall using screws. Finally, add the connector duct with the wall cap. And, attach the connector with the flexible duct and secure the ducting hose firmly with duct tape. Take the duct line inside by pushing the cap inward with your hands.
Once the cap reaches close to the wall, attach it firmly to that position using screws. This step is a very significant part of the bath fan installation process.
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