3. COMPONENT DESCRIPTION 3.1 C ompliance T o A pplicable C odes
This Spray Booth is designed to be in strict accordance with the National Fire Protection Association Standard Number 33, “Spray Application Using Flammable Combustible Materials. The NFPA Standard Safety Code for the Design, Construction and Ventilation of Spray Finishing Operations.” This spray booth meets or exceeds the requirements of the Occupational Safety and Health Administration (OSHA). 3.2 M aterial S pecifications The spray booth panels, filter racks and product doors are constructed of 18- gauge steel, conforming to ASTM A527 “Lock Forming Quality” and are hot dipped galvanized per ASTM A525. All structural steel conforms to ASTM A36. 3.3 G eneral D escription The spray booth consists of four major components: paint area, exhaust fan and chamber, product doors and, in some cases, an air make-up unit. A brief description is provided for these and other related items. 3.3.1 P aint A rea The paint area is the actual “booth” part of the spray booth. Parts are placed in this area, through product doors, if so equipped, to be painted. Air flows from the intake filters of the booth to the exhaust filters. The booth is constructed of 18-gauge galvanized sheet metal panels which are bolted together. The booth exhaust is routed through the exhaust plenum at the exit of the booth. The exhaust fan then routes the exhaust out through the exhaust duct and discharges it at a point above the roof height of the building. 3.3.2 E xhaust F an A nd C hambers The booth exhaust chamber(s) is/are located as shown in the mechanical drawing package included with this manual. Exhaust gases are pumped through the exhaust duct by an electrically powered fan. The fan is made of spark resistant material and the motor is located out of the air stream. The exhaust chamber(s) operate(s) under a negative pressure to induce the required airflow through the exhaust filters. 3.3.3 P roduct D oors The product doors can be filtered or solid and may be either overhead doors, bi-fold doors, or tri-fold doors. Some industrial spray booths have an open front in lieu of product doors. Overhead doors are equipped with an intrinsically safe pneumatic safety edge. There are two 3-button controls to operate each door. Doors can be manually operated also. 3.3.4 D oor L atch Door latches secure doors in closed position and hold contact against foam rubber seal. Latches are pressure relief latches that allow doors to open in case of explosion. This feature also allows for ease of booth operator egress from spray booth by applying moderate pressure to the door from inside booth. 3.3.5 D oor L imit S witch Optional micro switch to indicate when a door is open on the booth. If a door is in the open position, micro switch contact is opened which breaks the circuit for the paint air solenoid.
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