Two new Dinol booths for vertical paint and coating processes were added in the 4-86 Building at Boeing’s Renton plant to improve the efficiency of the wing-coating process and increase 737 aircraft production rates. Booths include pile foundations, an underground concrete plenum area with full air filtration, suspended production floor slab with downdraft airflow ventilation, mechanical mezzanine, exhaust system with support structure, medium voltage electrical substation, lighting and new overhead door openings.