Spray Booth

Definition and Core Role

A spray booth, formally known as an automotive spray paint and bake booth, is a dedicated enclosed operating facility designed for applying and baking vehicle paint during the automotive refinishing process. It provides body and paint repair workshops with a safe, clean, and highly efficient working environment, while functioning to filter and purify paint emission vapours. In the automotive repair and refinishing sector, the spray booth serves as the essential hardware foundation for body paintwork quality—its air purity, temperature regulation precision, and exhaust filtration capability directly dictate the final paint finish and environmental compliance standards following a respray.

Structural Composition

Automotive spray booths feature a modular interlocking design. The booth cabin utilises tongue-and-groove insulated powder-coated wall panels, delivering superior airtightness and thermal insulation. A side access door is fitted for workshop technicians, while the main entrance door features aluminium framing and a central observation window for monitoring internal operations in real time. The cabin is equipped with low-noise, high-volume blower fans, premium stainless steel heat exchangers, and a multi-stage filtration system.

In terms of functional layout, a spray booth setup primarily comprises a prep area, a spray zone, a baking/curing zone, and auxiliary facilities. The preparation area is used for vehicle surface cleaning, degreasing, and masking; the spray zone houses professional spray gun apparatus; while the baking zone utilises the booth's heating system to dry and cure the fresh paint layer.

Working Principle

Spray booths operate under dual modes—spraying and baking—with mode selection managed via automated dampers.

In spraying mode, ambient air is drawn through primary pre-filters by blower fans and channelled into the ceiling plenum, entering the main cabin after undergoing secondary fine filtration. The booth adopts a full downdraft airflow design moving vertically downwards at 0.2 to 0.3 m/s, preventing overspray mist from lingering in suspension and expelling it through floor exhaust extraction grilles. With continuous forced airflow circulation, cabin air purity during spraying exceeds 98%.

In baking mode, dampers switch over to activate internal hot-air recirculation. The intake fan draws fresh air through the pre-filters across the heat exchanger, feeding it into the ceiling plenum for secondary filtration before entering the cabin. Aside from introducing a minimal amount of fresh makeup air, the vast majority of heated air is recycled and reheated, progressively raising cabin temperatures to the target curing range of 55°C to 80°C. The burner automatically modulates or shuts down upon reaching the preset temperature and reignites when it drops, maintaining a stable thermal environment throughout the bake cycle.

Main Classifications

Spray booths can be categorised based on several key specifications.

By heating system, booths are categorised into diesel-fired, electric, steam, infrared (IR), and waste oil heating variants. Among these, fuel- and gas-fired spray booths currently account for under 10% of the domestic market.

By airflow configuration, they are classified into crossdraft, semi-downdraft (side downdraft), and full downdraft booths. Crossdraft setups offer lower initial cost but compromised air quality; full downdraft represents modern industry best practice, introducing air through the ceiling and extracting it via floor pits to deliver the cleanest finish.

By overspray filtration method, booths are split into dry-filter and wet-scrubber (water wash) booths. Dry filtration is the standard choice in automotive refinishing, requiring scheduled inspection and media replacement.

By specification and layout, units are divided into standard vs custom-built configurations, standard vs premium specifications, as well as outdoor all-weather, technical training, large drive-through, eco-compliant, and infrared curing models.

Industry Standards and Safety Regulations

The design, manufacturing, inspection, and operation of automotive spray booths are governed strictly by the transport industry standard JT/T 324-2022 "Automotive Spray and Baking Booth" . Promulgated on 13 September 2022 and enforced on 13 March 2023, this standard supersedes the 2008 edition. The 2022 standard introduces three major upgrades: enhanced safety (mandatory flammability ratings for booth walls and insulation core), environmental compliance (refined VOC and exhaust purification metrics), and energy efficiency optimisation (detailed guidelines for electric heating elements). Booth cabin materials must meet Grade A or B1 fire resistance standards, with lighting harness wiring rated to withstand at least 120°C. The standard also mandates exhaust emissions compliance with GB 16297, imposing stringent limits on benzene-series VOC concentrations.

For operational safety, spray booths must be fitted with combustible gas detection alarms interlocked with the ventilation and exhaust extraction system. Technicians must don appropriate PPE prior to entering the booth, while smoking and open flames are strictly forbidden inside. Approved firefighting equipment must be stationed immediately adjacent to the booth.

Maintenance and Servicing

Routine maintenance of spray booths is essential to uphold refinish quality and workshop safety. Daily, technicians must sweep and clean the floor grates and pit areas, checking and maintaining overall cleanliness. Weekly, clean the intake pre-filters and inspect exhaust filters for clogging. Monthly, clean the intake filter media, floor filter mats, and the burner diesel fuel filter. Replace floor exhaust fibreglass filter media every 150 operating hours, and renew intake pre-filters every 300 hours. Primary intake filter media should be replaced every 100 operating hours, and fine ceiling filter media roughly every 400 hours. A comprehensive filter maintenance log must be kept, with final exhaust pocket filters recommended for replacement every 500 operating hours.

Development Trends

As of 2026, automotive spray booths are rapidly advancing towards eco-friendliness, smart automation, and high thermal efficiency. On the environmental front, the adoption of waterborne paint systems and low-VOC abatement technologies is expanding rapidly. In terms of smart technology, intelligent-controlled spray booths now hold a 61.2% market share, with the convergence of AI algorithms and IoT connectivity accelerating the industry's shift from empirical guesswork to data-driven precision. The market outlook remains exceptionally strong, projected to exceed RM3,600,000,000 in 2025 and on track to surpass RM5,400,000,000 by 2030. Globally, the automotive workshop spray booth market is valued at approximately USD 1.28 billion in 2025. Overall, the spray booth is evolving from a conventional refinishing enclosure into a sophisticated piece of industrial equipment integrating green technology, smart automation, and intelligent energy management.