The following metrics are hard, digital standards widely used in industry acceptance testing and equipment selection. They directly determine the compliance, painting quality, and service life of a spray paint booth, and can be used directly for procurement acceptance and equipment rating.

1. Material Quality (Digital Metrics)

1. Booth Panels: Outer wall ≥ 0.426mm color-coated steel sheet; inner wall ≥ 0.376mm galvanized sheet; rock wool insulation layer density ≥ 120kg/m³, thickness ≥ 50mm

2. Steel Structure Frame: Square tube wall thickness ≥ 2.0mm; galvanized coating thickness ≥ 85μm; rust and corrosion protection lifespan ≥ 8 years

3. Floor Grating: Galvanized steel grating thickness ≥ 3.0mm; load capacity ≥ 300kg/m²; anti-slip coefficient ≥ 0.6

2. Air Supply (Fan Room) Core Metrics

1. Fan Configuration: Supply fan power ≥ 5.5kW per unit; exhaust fan power ≥ 5.5kW per unit; airflow rate ≥ 25,000m³/h per unit

2. Air Pressure: Static pressure ≥ 300Pa; dynamic pressure ≤ 50Pa; fan noise ≤ 75dB(A)

3. Motor Protection Rating: IP55 or higher; insulation class F; continuous operating time ≥ 8 hours

3. Air Intake Pathway Metrics

1. Filtration System: Primary filter efficiency ≥ G4 (≥80%); ceiling filter efficiency ≥ F5 (≥95%); high-efficiency filter ≥ F6

2. Intake Air Velocity: 0.3–0.5 m/s during painting mode; 0.2–0.4 m/s during baking mode

3. Air Exchange Rate: ≥ 260 times/hour during painting; ≥ 180 times/hour during baking

4. Exhaust Pathway Metrics

1. Emission Concentration: Non-methane total hydrocarbons ≤ 60mg/m³; particulate matter ≤ 10mg/m³ (compliant with GB 24433-2023)

2. Activated Carbon Adsorption Unit: Iodine adsorption value ≥ 800mg/g; fill volume ≥ 100kg per unit

3. Regenerative Catalytic Oxidizer (RCO): Light-off temperature 250–300°C; purification efficiency ≥ 95%

5. Paint Mist Control Metrics

1. Paint Mist Capture Rate: Dry filtration ≥ 98%; wet Venturi scrubber ≥ 99%

2. Overspray Residue: Suspended paint mist inside booth ≤ 2mg/m³; surface particle count ≤ 3 particles/m² on workpiece

3. Airflow Pattern: Vertical laminar flow rate ≥ 90%; no vortex dead zones

6. Temperature Rise Speed Metrics

1. Heating Efficiency: 20°C → 60°C in ≤ 25 minutes; 20°C → 80°C in ≤ 30 minutes (Northern regions; Southern regions approximately 10 minutes less)

2. Temperature Uniformity: Temperature difference inside booth ≤ ±2°C; temperature difference between top and bottom ≤ 3°C

3. Thermal Efficiency: Oil-fired type ≥ 85%; electric heating type ≥ 98%

7. Exhaust Ductwork Metrics

1. Duct Material: Galvanized spiral duct wall thickness ≥ 1.2mm; stainless steel duct wall thickness ≥ 1.0mm

2. Exhaust Air Velocity: Main duct ≥ 12 m/s; branch ducts ≥ 8 m/s

3. Sealing Performance: Air leakage rate ≤ 3%; negative pressure inside duct ≥ 200Pa

8. Operational Safety Metrics

1. Explosion Protection Rating: Electrical components Ex d IIB T4; booth explosion protection rating ≥ Ex II 2GD

2. Safety Devices: Over-temperature alarm at ≤ 70°C; emergency stop response time ≤ 0.5 seconds

3. Fire Suppression System: Sprinkler activation temperature ≤ 68°C; fire extinguishing response time ≤ 3 seconds; combustible gas alarm concentration ≤ 25% LEL