Airflow in paint spray booths. In a downdraft booth an exhaust fan installed low down pulls out vapor-laden air while make-up air enters from the top of the booth. Keep your booth clean . Booths are usually configured in one of two ways to provide adequate ventilation. Cleaning your paint booth is one of the best ways to maintain quality air … Iliving - 36" Wall Mounted Shutter Exhaust Fan - Automatic Shutter - Single Speed - Vent Fan For Hom… These are downdraft and cross draft.