Make sure you run your joints in right direction... Think of "exhaust flow", like water flow
It's not the prettiest, it was pretty much a mock up and experiment... I used a used piece of pipe elbow we had from a 40gal. gas water heater.
I used a left angle from Eccotemp because I mounted on a interior right angle wall, instead of outside wall.
If I had put it on the outside wall, I wouldn't have used the horizontal pipe, and would have shortened the pipe on dryer vent.
Overall, it's under 3'
I'll mount it on heater tomorrow evening and grab a pic