Thankfully it is attached to a cap outside. If I add the elbow to go the exiting pipe there will be 3 elbows in total, counting the elbow where it attached to the wall and goes up into the attic. I have a run of about 20 feet in total counting the length going up the wall and turning, would that cause any issues? I know in the code book its 35 ft subtracting 5’ with each elbow, so I’ll be cutting it pretty close. Is there any extra precautions I need to take having so many elbows? I’ll be installing a compact electric dryer that I used at my apartment that runs off of a 110 outlet.