I don't know if you can make it out or not, but it is only screwed to the sheet metal at the top.
Notice the 3 inch gap between the duct, and the heat exhanger. This is just pure laziness if you ask me. It looks like when it was built, they made the box under the heat exchanger the wrong size, or mounted it too far to the left of the trailer, and then just taped the heck out it to fix it, instead of fixing it properly.
To fix, I took some new sheet metal, and made an extension to the heat exchanger, routing it into the floor duct, and riveting it in place. I then used aluminum duct tape to seal all of the joints.
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