I am building a 30'x40' shop and plan to build a paint booth in one side of it. I've attached a quick sketch I did in paint to show want I was planning to do. I've never actaully painted in a professional spray booth so my knowledge is limited and I could really use some input. Basically what I am planning is to have a pit with a grate over it running down the center of the booth. Then have 3 pieces of PVC pipe to route air to run out of the pit to a fan box outside the shop. It will be a negative pressure booth with the air inlet coming from filters in the ceiling. The pit will have a drain in it to drain water for when I wash out the booth. Lights will be recessed into the walls and the aircompressor will be in a separate room behind the booth.
I don't know if the 3 pieces of PVC will provide good even flow down and out of the booth.
How big should my PVC be? I was thinking about using 10 inch.
Is this the best route to take in building a booth, downdraft I mean? I work in construction so building it is the easy part and will surely save me some money versus buying one.
I will have a backhoe digging the the footing for the house tomorrow and was planning to dig the pit for the paint booth as well as bury the pvc while I was at it.