Dust collection (ventilation system) connected to the booth . Pipes go thru the wall and to the dust collector outside.

Inside view of ventilation system
Hopefully this "cocoon"  will prevent any overspray from getting out into the rest of the garage.

The suction from the dust collector is great enough that it would collapse the sides if I hadn't cut in cross ventilation holes.

Shows speedster inside booth, 2nd "T" on top.