If the measurements are correct then the hole should sit 4 to 5 inches from the wall where the dryer is.
Dryer vent into the attic fixed.
You should then measure a small hole in the ceiling to fit the dryer vent into.
Continue the ductwork horizontally through the attic to the closest exterior wall.
Pitch the attic ductwork back toward the dryer so that any condensation will run back toward the heated space.
A normal dryer vent size is around 4 inches wide.
Be careful you don t cut through any studs electrical wires or pipes in the process.
If venting outside isn t an option you can vent the dryer out of the attic through the roof using a special roof vent to keep rain out.
Support the ductwork adequately to maintain this pitch don t allow the ductwork to sag in the middle.
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.
If you find that it is not you can adjust it.
Here s what the florida building code fbc residential edition says about it.