Sizing the Spray Booth System
Determining spray booth size is an important step in developing the system design. It will influence the spray booth location and be influenced by the type of operation (manual or automatic). Reviewing the facility layout and proposed spray booth location will help determine whether the allotted space is adequate for the size and style of the spray booth.
A properly-sized spray booth for manual spray operations will give the operator and the finishing equipment adequate room in which to work. This means there will be enough space for the operator to move around, stoop down and bend over, and allows an even, fluid arm motion.
For an automated application, the correct size spray booth will provide enough space for automatic equipment to operate effectively. This includes allowing for the operation of side-to-side and overhead reciprocators, and providing the necessary clearances for electrostatic equipment. During finishing, there should be sufficient velocity through the spray booth and past the equipment to keep it in clean operating condition. When conveyors are transporting parts through the spray booth, the spray booth size is directly related to conveyor speed.
Minimum and maximum part dimensions determine the spray booth width, height and depth. Conveyor openings are required when a conveyor moves parts through the spray booth. Conveyor openings should allow a minimum clearance of 6 inches around the part.
To determine the proper width for your paint booth, measure the width dimension of the largest vehicle or part, including fixture or pallet, and add 2 feet minimum clearance on each end. In multiple-operator booths, allow a minimum of 6 to 8 feet for each finisher.
In conveyorized processes, the width must be sufficient to allow finishers to complete the finishing operation within an allotted time, and spraying should not be closer than 2 feet from the conveyor opening. This space permits the part to be turned, if necessary, and enables the operator to work comfortably.
In the auto refinish industry, paint booths come in standard widths, typically 12 to 16 feet. Custom sizes are also available for special applications.
The height of the paint booth is determined by the overall height of the largest item, plus the height of its holding fixture, plus 2 to 3 feet of clearance.
This measurement gives the operator sufficient room to coat the top of the part without coating the spray booth ceiling. The part should also be high enough above the floor to allow the operator room to easily spray the lower edges and the underside.
In the auto refinish industry, paint booths range in standard heights from 8 to 10 feet. For repairs of large trucks and transit vans, extended-height paint booths range from 12 to 15 feet high.
Sufficient working depth will allow at least 3 feet between the rear of the part and the filter pads or water wash tank; at least 3 feet between the front of the part and the paint booth face or intake filters; and allow for automatic machines, such as reciprocators in conveyor applications.
Working depth should be sufficient for the part, including the fixture or pallet, to be entirely within the paint booth enclosure during finishing, plus allow for clearance at the rear. The finisher should work within the front line of the paint booth, except on bench-type or open-face spray booths.
Standard auto refinish paint booths range from 24 to 30 feet in length, including prep stalls. For specialty applications, such as used car refurbishment, tunnel booths can range from 40 to over 100 feet in length.