My question is the way they vented my 95 % Goodman furnace is out the side of my house with one pipe. What I would like to do is use a concentric vent, my problem is the floor joist go the wrong way. Can I cut through the joist ,or will that weaken the structure. It would be at the end of the joist near the corner of the wall.
You might post some pictures for the guys to review. My vent runs along under the joists about 10 feet and then turns 90º and then has two 45º fittings that take it up between two joist and out the back of the house.
On the concentric, I'm sure some guys think they are fine in a horizonal position, but I removed mine and ran two separate pipes in it's place. I was having intake air problems and when I removed the concentric to install the two pipes, I found the lower 30 to 40% of the intake area filled with grass clippings and spider webs. This concentric was located about 3.5 feet from the ground and was behind shrubs. So clippings from mowing were not being blown in it's direction. It was collecting them out of the air.