So while redoing some flooring in my laundry room, I discovered that whoever built my house in 1995 got real lazy and used a flexible foil pipe to connect the dryer vent in the wall through the floor and out the back of the house. After opening up the floor in a couple spots to run a new pipe, I also discovered that the foil pipe had caught fire at some point and burned a big chunk of the pipe away. So for who knows how long, the dryer was just venting into the floor/ceiling of my house.
Any who, the problem I have now is there is a sewer line running inside of the same ceiling bay and the dryer vent and the distance between the top of the pipe and the bottom of the subfloor is barely 3". Code requires a 4" metal pipe for dryer vents but that's impossible given the space I have to run it through. Rerouting the dryer vent would be extremely difficult and not ideal since it's already a straight shot from the laundry room to the vent outside. Any ideas on how to fit a 4" pipe through a 3" space?
