Home clothes dryers don t start out venting into an enclosed space because the building code specifies that the termination of a dryer duct must be outside.
Dryer vent into the attic fixed.
You should then measure a small hole in the ceiling to fit the dryer vent into.
The international residential code allows you to run a dryer vent through the attic but you can t terminate it there.
Doing so would fill your attic with warm moist air that could rot the framing.
Here s what the florida building code fbc residential edition says about it.
If you find that it is not you can adjust it.
A normal dryer vent size is around 4 inches wide.
When venting dryers for long distances use rigid metal pipe with as few elbows as possible.
Be careful you don t cut through any studs electrical wires or pipes in the process.
Support the ductwork adequately to maintain this pitch don t allow the ductwork to sag in the middle.
If the measurements are correct then the hole should sit 4 to 5 inches from the wall where the dryer is.