What happens is that, soffit pulls that warm moist air into the attic in the wintertime. First, we must set a mark of the vent hole. The best way is to mark with nails in the middle of the rafter bay. Then, go to the outside and locate the nail. Now, you can see where the nail came through the roof. It actually has a little door on the inside here that will close with gravity.
The function is to keep the cold air from blowing back into the bathroom when the fan is off. It has a screen right there to keep the critters out. Then, you should remove some roof shingles so you can drill a hole. First, you must measure the vent hood. That will center my vent hood right over the nail. After that, cut right across the area you want to put the vent hood on and remove that shingle.
Now, I got to break the seal of the shingle so I can slide the vent hood up under the shingles. Most of the time, when you place the vent hood between the shingles, it should fit good. If your original duct work is uninsulated, then change it to an insulated duct system. By doing that, it will lessen the chance of condensation forming in the winter when your attic is cold.
You need to put sleeve into the pipe so you can connect the duct work to the roof. The first thing you need to do is you need to crimp this so it will fit inside the pipe.
As a result, it will fit inside this 4-inch pipe. To hold the two together, you are going to use a foil duct tape. Note: you need another person under the roof helping you to slide the ductwork up to the outside. To hold the ductwork into its position, you are simply going to cut a couple of tabs on each side so you can nail it to the roof. But first, connect a 4-inch degree elbow-shaped hose to the exterior part of the fan housing. The setting will be more stable, and your duct line will be well supported.
Use the foil duct to securely cling to it. Remove the knockout hole from the cable connecting section as well. Finally, place the fan in the fan housing and ensure that it is properly centered.
Please be patient! Before you get there, you must first determine the location of the roof vent hole while still inside the attic. Simply place a nail in the desired location.
Ensure the nail is long enough and visible from above so you can readily identify that location from the roof. Keep in mind that the roof vent should not be too far away from the fan. To climb to the rooftop, use a good condition extension ladder after marking the location with a nail.
Draw a four-inch round hole around the nail near the point where it came through. Because the duct line is 4-inch wide, you must drill a four-inch hole. As a result, a larger or smaller hole will cause a variety of issues. Some roof sheets must be removed in order to make the hole. If your roof is covered in shingles, you should remove them with a utility knife.
Learning the right way on how to install a bathroom vent through a wall will be necessary then. Now with the right access to attic, using a fan vent on a gable wall or roof is just the right thing to do. Also, if you have bathroom exhaust fans with light then there should be an additional or double switch. So, you can easily turn it on or off. In other cases, you need to set up new wiring for operating a double switch.
Smooth and tough ducts with taped joints screwed nicely through special vent hood. And you have your finest exhaust fan venting system. However, in attic crawl areas, this becomes quite not possible.
In most home centers, you will discover that the 4-inch duct is wrapped already in insulation. So, your temptation to vent exhaust fan through the attic or existing roof vent might not be a right thing to follow. The partial block will happen with roof vent through piping. This is enough to reduce the cool airflow through attic.
Also, during cold winter days, the warm and moist air will be blowing onto cold surfaces. This is usually the roof plywood and vent. And as a result, there will be water condensing.
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