Open Face vs Enclosed Paint Booths

How an Open Front Booth Moves Air

An open face booth pulls room air in across the full open front and draws it toward a filter bank and exhaust fan at the rear wall. The painter stands in the open front, part in the booth, and sprays toward the filters. There is no intake filter and no door, so the air entering the booth is simply plant air. An enclosed booth replaces that with filtered intake through doors, an intake wall or a ceiling plenum, and the cabin is sealed so the booth controls where air comes from.

• Open face booths are a form of crossdraft airflow with an unfiltered intake.
• Enclosed booths can be crossdraft, semi-downdraft, side downdraft or full downdraft.
• Open face booths often have no lights or controls beyond the exhaust fan and basic interlocks, while enclosed booths usually carry more equipment.

Contamination Control and Finish Expectations

Because an open face booth breathes plant air, whatever is in that air reaches the wet film: grinding dust, weld smoke, forklift exhaust, fibers and general shop dirt. That is acceptable for touch-up, small parts, primers, stains, adhesives, and protective coatings where appearance is secondary. For finish-critical work, an enclosed booth with filtered intake is far more consistent. The enclosure also keeps overspray, odor and solvent vapor from spreading back into the shop when the painter steps away, which matters when other trades work nearby. Shops with both needs often run an open face booth for small or utility jobs and an enclosed cabin for topcoat.

Part Size and Booth Footprint

Open face booths work best for parts that fit comfortably inside the three walls, with room for the painter to work in the open front. Small fabrications, components on a bench or a cart, and parts hung on a rack are typical. Larger parts that need the painter to walk around them are better served by an enclosed booth where the painter is inside the airflow on all sides. Open face booths also come as wide, shallow units for long but slender parts. In each case, measure the largest workpiece plus clearance for the painter, the spray gun and the cart or hanger.

Heat, Make-Up Air and the Rest of the Building

Every booth exhausts shop air, and an open face booth exhausts it directly from the room. In winter, that pulls heated air out of the plant and draws in cold air through doors and gaps elsewhere. In summer it can pull in humid outside air. The answer is make-up air: a unit that brings in tempered outdoor air to replace what the booth exhausts. Enclosed booths are often designed with a dedicated make-up air unit feeding the cabin directly, which keeps the booth balanced and protects the rest of the building. Open face booths rely on building make-up air, so the plant HVAC and any make-up air units need to be sized with the booth exhaust in mind.

• Note existing make-up air units, roof space and gas service near the booth location.
• Check whether shop doors are hard to open when the booth runs, a common sign of negative pressure.
• Plan the exhaust stack location relative to intakes on the roof.

Cost Factors and Where Open Face Booths Fit

Open face booths generally involve less equipment: no doors, no intake filters, often no dedicated heater and fewer controls. They go up quickly and are easier to move. Enclosed booths cost more to build and install because of the cabin, doors, lighting, intake system and controls, but they deliver more consistent finishes and better containment. Open face booths fit well in maintenance shops, fabrication shops doing primers or touch-up, woodworking and furniture finishing, assembly lines where small parts get a coat in place, and school or training programs. Fire protection, electrical classification near the open front and clearance to combustibles still apply to both, and your fire marshal and insurer will look at the booth regardless of style.