| Booth Configuration |
Downdraft or semi-downdraft airflow for premium refinishing; crossdraft systems may be suitable for lower-cost, lower-throughput work. |
Airflow direction strongly affects overspray capture, finish quality, filter loading, and operator exposure. |
Request an airflow diagram, pressure-loss calculation, and measured velocity map at the working height. |
Local mechanical, fire, and occupational-safety codes |
| Working Dimensions |
Allow at least 0.9–1.2 m of clear working space around the vehicle where practical; provide sufficient height for doors, hoods, lamps, and spray movement. |
Clearance improves coating uniformity, operator movement, and safe access during masking and inspection. |
Check the internal clear dimensions against the largest vehicle type, wheelbase, door opening, and service equipment. |
Project-specific layout and local building requirements |
| Airflow Velocity |
Common enclosed-booth design targets are approximately 0.25–0.50 m/s (50–100 fpm), subject to booth type and local regulations. |
Insufficient airflow can increase overspray and vapor exposure; excessive airflow can waste energy and disturb the spray pattern. |
Use calibrated anemometers or an independent commissioning test; verify uniformity, not only one center-point reading. |
OSHA 29 CFR 1910.94(c); NFPA 33; applicable national standards |
| Air Pressure Balance |
Maintain a controlled, slightly positive booth pressure during spraying, commonly around +10 to +30 Pa relative to adjacent areas. |
Stable pressure helps prevent unfiltered shop air from entering the booth and reduces dust contamination. |
Review differential-pressure gauges, automatic damper controls, makeup-air capacity, and pressure alarms. |
Manufacturer engineering data and local ventilation code |
| Air Filtration |
Use staged intake filtration and appropriately rated exhaust arrestor filters; final efficiency must be selected for the coating system and local emission rules. |
Proper filtration protects the finish, fan, ductwork, workers, and surrounding environment. |
Request filter class, test standard, pressure-drop data, replacement interval, and access for safe maintenance. |
ISO 16890 or equivalent regional filter classification; local air-quality rules |
| Temperature Control |
Typical spray conditions are approximately 20–25 °C; bake or cure cycles commonly range from 50–80 °C, depending on the coating system and vehicle repair process. |
Stable temperature affects viscosity, atomization, flash-off, curing time, gloss, and color consistency. |
Check temperature uniformity, sensor calibration, maximum surface temperature, and compatibility with the paint manufacturer’s technical data sheet. |
Coating-system technical data; equipment safety code |
| Humidity and Condensation Control |
A practical spray-area target is often 40–60% relative humidity, unless the coating supplier specifies another range. |
High humidity can cause blushing, poor adhesion, corrosion, and extended drying; very low humidity can increase static and dust attraction. |
Specify a calibrated temperature/RH sensor and, where required, dehumidification or heated makeup air. |
Coating supplier requirements; local climate and HVAC standards |
| Lighting Quality |
Provide uniform, low-glare illumination of approximately 800–1,200 lux at the vehicle surface, with high color-rendering performance. |
Consistent lighting improves color matching, defect detection, blending, and final inspection. |
Measure lux at multiple points and confirm sealed, cleanable, impact-resistant fixtures suitable for hazardous locations. |
EN 12464-1 or equivalent workplace-lighting guidance; hazardous-area rules |
| VOC and Overspray Control |
Use compliant coatings, correct spray-gun transfer efficiency, effective exhaust capture, and approved waste-handling procedures. |
VOC emissions and particulate overspray affect worker health, permitting, neighborhood impact, and operating cost. |
Review the local permit threshold, coating VOC content, transfer-efficiency data, emission calculations, and filter-disposal process. |
U.S. 40 CFR Part 63 Subpart HHHHHH or equivalent national/regional requirements |
| Fire and Explosion Protection |
Use non-sparking construction where required, properly rated electrical equipment, bonding and grounding, emergency stop controls, and suitable fire protection. |
Solvent vapors and overspray can create rapidly developing fire or explosion hazards. |
Require a documented hazardous-area classification, interlocked burner operation, fire-detection strategy, and inspection access. |
NFPA 33; ATEX 2014/34/EU where applicable; local fire code |
| Heating and Burner Safety |
Indirect-fired heating is generally preferred for solvent-based spray processes; direct-fired systems require specific combustion and ventilation controls. |
Heating equipment must not introduce ignition sources or combustion products into the spray atmosphere. |
Verify burner interlocks, purge cycles, flame-failure protection, high-temperature cut-outs, and combustion-air separation. |
NFPA 33; applicable gas, electrical, and machinery-safety standards |
| Energy Efficiency |
Prioritize variable-speed fans, demand-controlled makeup air, insulated panels, heat recovery where permitted, and efficient cure scheduling. |
Ventilation and heating are usually the largest contributors to booth energy consumption. |
Compare specific energy consumption, fan motor efficiency, heat-up time, standby mode, and annual operating assumptions. |
Local energy codes; IEC/EN motor-efficiency requirements where applicable |
| Noise and Operator Ergonomics |
Design for a low-noise working environment; a common procurement goal is below 75–80 dBA at the operator position. |
Lower noise improves communication, comfort, and long-term occupational safety. |
Request sound-pressure test data measured under normal operating conditions and review access, visibility, and control-panel height. |
ISO 3744 or equivalent acoustic test methods; local occupational-noise limits |
| Controls and Interlocks |
Include airflow proving, filter loading indication, burner interlock, door status, emergency stop, pressure monitoring, and fault alarms. |
Interlocks prevent unsafe spraying, heating, or curing when ventilation or filtration is inadequate. |
Test every alarm and shutdown function during factory acceptance and site commissioning. |
IEC 60204-1; ISO 13849-1 or equivalent machinery-safety requirements |
| Maintenance and Consumables |
Provide tool-free or low-risk filter access, washable surfaces, inspection doors, drainage control, and clearly defined filter replacement intervals. |
Easy maintenance preserves airflow, finish quality, safety, and total cost of ownership. |
Evaluate annual filter cost, spare-parts availability, cleaning time, lockout/tagout access, and maintenance records. |
Manufacturer maintenance instructions; local workplace-safety regulations |
| Documentation and Commissioning |
Require operating manuals, electrical drawings, airflow test results, pressure readings, safety certificates, and commissioning records. |
Complete documentation supports permitting, training, audits, troubleshooting, and future resale or relocation. |
Make final payment conditional on documented performance tests and operator training. |
Local authority requirements; project quality-assurance procedures |
| International Compliance Readiness |
Confirm before purchase Equipment should be configurable for the destination country’s electrical supply, fire code, emissions rules, and hazardous-area requirements. |
A booth compliant in one country may require changes to electrical components, ventilation, documentation, or fire protection elsewhere. |
Obtain a country-specific compliance matrix covering voltage/frequency, certification marks, language, permits, and installation responsibility. |
Destination-country laws and recognized conformity-assessment systems |
