Do these type of seams in duct work need to be taped or sealed? I am trying to make sure all the duct work I have access to is fairly tight.
The returns in my house are stud bays. I noticed on this one return that the hole went through the drywall on the other side into the soffit of one of the cabinets. (I have NO idea why this was done.) Should I seal up the hole into the soffit so the return draws better? Or does it not matter since the soffit area is basically sealed? Thanks.