I have a gas water heater in my home which I’m pretty sure was not installed up to code and done without a permit. I am looking at selling soon and trying to pre-resolve any issues which may come up.
The water heater is in a small alcove inside a laundry room (so in conditioned space). On the other side of the alcove is the garage, there is a vent hole cut in wall between the alcove and the garage. It’s covered with a HVAC vent grate on both sides. This was obviously added in after the fact, as they cut a hole in the drywall on both sides, took out the insulation and covered it with the vent grates.
A drain pan was installed and the same garage wall was penetrated with a 1" PVC pipe. The PVC terminates inside the garage at the garage floor.
My question is, how wrong is this? I believe this is penetrating a fire rated wall (since it’s garage on one side). Can a combustion air vent be done this way? Can the PVC drain pipe penetrate the wall that way?