Remove Dead Animal from Chimney
We need help locating and removing a dead animal from the house. It could be in the chimney. Actual location unknown. It creates a huge smell problem.
Visual inspection of the chimney shows nothing. However, bats used to penetrate into the house via chimney.
Burning wood in the fireplace helps remove the smell temporarily, mostly because a lot of in-house air is drafted out. Next day the smell of a dead body returns, especially when it is hot outside.
Another possibility is that something died in an in-house enclosure, such as a ceiling with built-in lights.
The first thing to do is locating the problem. The smell is most obvious in the living room, but it is actually unclear where it is coming from.
Visually, there is nothing suspicious in the lower parts of the chimney, or anywhere else.
In an effort to isolate the source of smell, we sealed the doors and the fireplace with pieces of a polyethylene film. Smell returned next day, so an animal must have died in the ceiling, as it has a few enclosed lights, etc. But how do we actually see it?
One thing we could try is using a small USB camera and inserting it into the gaps between fixtures and ceiling parts.
USB camera (endoscope)
The camera has a diameter of approx. 8 mm, so we can actually move the fixtures a little and insert a camera into the gaps.
However, interpreting results is kind of hard, as most pictures reveal something unknown, like from a spacecraft looking into the void. There is definitely no dead body here that we can identify.
Okay then, let's examine the fireplace again, perhaps our poly film did not seal it properly, and the smell comes from there. Herfe is how a fireplace looks like with the frame and glass doors removed.
Fireplace with frame removed
Now, immediately above fireplace there are some pipes to warm room air, and an air shutter above them. The shutter is used to open / close access to the chimney.
Fireplace shutter closed
You can open the shutter with a handle, as seen on the photo.
Fireplace shutter partially opened
Moving the handle move the shutter plate upward, therefore opening access to chimney exhaust.
Fireplace shutter fully opened
A fully opened shutter is at approximately vertical position. The shutter plate kind of stands, its long edge being horizontal, and narrow edge being approximately vertical. The exact fully opened position is actually at some angle, but for the purpose of this project it does not matter.
The point is that there is actually some room behind the shutter, large enough for a small animal such as a rat or a cat.
So, speaking theoretically, with shutter closed, and a small animal falling accidentally through chimney down, there could be a problem if the poor creature cannot climb out. If it dies there, one would not see it, just smell.
To prove the theory we need to look behind and below the chimney shutter.
Locating the Animal
There are actually a couple of ways to "look" in there. Although it is kind of hard, and reminds of removing a tooth through an ass, it is still realistic to obtain images.
The first method is using a phone camera. You start with removing a frame from the fireplace and opening a shutter. Install a light source above shutter so that the place is illuminated upon. I used a halogen bulb attached to a fireplace utensil as on the picture below.
Light source and viewing tool
For the bulb to hold on above shutter plate, I made a hook out of wire.
Now, while carefully holding a phone in one hand, extend it just above the shutter, point the camera down, and make a few pictures or a movie. Make sure not to lose the phone!
The second method is using the endoscope camera with a handmade tool, as on the picture above. The shape of the tool allows you to insert and point the camera behind the shutter in the right direction.
Sure enough, we now can see a dead squirrel in there.
Dead squirrel in chimney
How to Make a Viewing Tool
To view behind a shutter plate, we need to insert the camera above the shutter, and then point it below and behind the chimney shutter plate. Therefore, we need something like two very narrow boards that are connected at one point at a sharp, adjustable angle.
Viewing tool prototype
Something like the above may work. The idea is that the shutter plate goes between the two pieces, and we may actually use the camera well below the shutter plate.
Viewing tool prototype with handle attached
As the space to insert the tool between pipes is quite narrow, we need to adjust the prototype accordingly, and also attach a handle to it, so that we can use the tool from the fireplace entrance.
Viewing tool without USB camera
The above screenshot shows the entire tool with the attached handle, without camera attached. The handle is from a fireplace utensil. We aim at using the handle to insert the tool above fireplace, and then point it down at the correct direction to search for animal.
You can see the viewing tool with the attached camera on one of the screenshots above. We just bend the cord accordingly and attach it to the pieces with masking or insulating tape.
Locating dead animal with a USB camera
Removing the Animal
Now that we know where the animal is located, we have to remove it.
This part is a bit tricky, as the squirrel is quite large. After trying a few methods, this is what worked for us.
The theory is that we would try to make a removal tool, which is similar to the viewing tool we just made, but a bit more heavy duty. So, instead of foam boards, we'll use two pieces of plywood.
Dead animal removal tool
We'll attach a camera to one side of the tool, and a vacuum hose to another.
Dead animal removal tool with camera and vacuum hose attached
The important part is to bend the vacuum hose properly so that you can still insert the tool between the pipes up in the chimney. The space there is narrow, so you may get creative about how to do it, and may be use a smaller hose.
The hose shown on the photo above is from a shop vacuum, which worked for this project. For actual removal, we moved the hose end a bit further down, so that the camera is maybe 3 inches above it.
Also, instead of a fixed angle with 2 screws connecting plywood pieces together, for the actual extraction of the animal we used a 1-screw connection, which allowed to adjust the angle.
The removal procedure is as follows. Insert the removal tool up the chimney and then down behind and below the shutter plate. Locate the animal so that you see it on camera. Put the tool all the way down so that the vacuum hose touches the body. Turn on vacuum so that the body is sucked into the hose opening and is attached to it. Now gently try to move the tool with the attached animal up the chimney until it shows just above the shutter plate. At this point turn the tool around, so that the animal is in front of the shutter plate. When you see it, grab it with another instrument such as pliers or a firewood utensil, and pull it down between the pipes.
You can then use the tool to collect the remaining debris from behind the shutter plate into a shop vacuum.
Installing the Barrier
We can see that the animal removal procedure is quite challenging. To stop this from happening in future, we need to install a metal barrier in chimney to keep bats and squirrels off. We can use something like a fridge shelving element, with not needed pieces cut off.
Metal barrier to install in chimney
We can cut off metal parts with an angle grinder as on the photo below.
Metal barrier with angle grinder
Looks good, but if we use it like that then we can keep off squirrels. Bats will still get through. Let us add chicken wire to it.
Barrier with chicken wire
Attach chicken wire to the frame using small aluminum wire pieces or something similar.
CORRECTION: chicken wire will eventually clog up with soot. It did for me after approximately a year of occasional (1 time a week) use. Therefore, use a mesh with wider holes and clean it up at least once a year, perhaps together with chimney sweep.
Chicken wire attached to metal barrier
Now we can put the barrier on top of the chimney.
Metal barrier installed on top of chimney
Chimney with installed barrier looks the same
Now it's a good time to give a fireplace a test burn.
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