The paint booth protects the surroundings from overspray and the painted project from dust. To contributor K: There is a need to control booth pressure. This reduces the possibility of dirt or contaminants entering the booth from the outside atmosphere. You achieve this by using a make up air unit that forces fresh air into the booth. And, learn how to make the clever duct tape hinges. Some paint booth systems are designed to keep a slightly positive pressure inside the booth. Make this DIY paint booth and use it for all of your spray painted projects. Watch this video to learn exactly how to build a homemade paint booth with common materials. DIY Spray Booth Is Both Light And Lit ... then a good alternative would be positive pressure from another vent. Face the fan toward the inside of the booth. If you pulled air from the paint booth through the fan instead, you could end up drawing dangerous fumes into the fan's motor. You're creating positive pressure, meaning you'll blow air in and let it out in another filter. I know someone that had to put out a fire in the filters in a spray booth…