Select explosion-proof air shower cabinets, the core is to first determine the explosion-proof level → then match the purification and size → finally check the material, electrical and certification. Five steps can lock in the compatible model, avoiding both safety and purification risks.
1. First, clearly define the hazardous environment (the explosion-proof level is the lifeline)
1) Hazard zone classification (GB 3836/GB 50058)
Zone 0: Continuous presence of flammable gas (rarely used, requires Ex ia intrinsically safe type)
Zone 1: May occur during normal operation (mainstream: Ex d IIB T4 flameproof type)
Zone 2: Only briefly present during abnormal conditions (optional: Ex d IIB T4 or Ex ec enhanced safety type)
2) Temperature group (T4 is the most commonly used)
T4 (≤135℃): Lithium batteries, chemicals, pharmaceuticals (suitable for most solvents / dust)
T6 (≤85℃): Highly flammable media (such as ether, ethylene oxide)
3) Typical industry configuration reference
Lithium battery workshop (aluminum powder / electrolyte vapor): Ex d IIB T4, 304 stainless steel, anti-static
Chemical / pharmaceutical (organic solvents): Ex d IIB T4, 316 stainless steel, corrosion-resistant
Spraying / ink (paint mist / solvent): Ex d IIB T4, anti-static nozzle, spark-free fan
2. Match purification level and air shower performance
1) Cleanliness level corresponding configuration
ISO 5–6 grades (hundred-level / thousand-level): H14 high efficiency, wind speed ≥ 28m/s, air shower 25–30s, all 304/316 stainless steel
ISO 7–8 grades (ten-thousand-level / hundred-thousand-level): H13 high efficiency, wind speed ≥ 25m/s, air shower 15–20s, 304 stainless steel
2) Core performance hard indicators (must be met)
Nozzle wind speed: ≥ 25m/s (dust removal rate ≥ 95%), prefer 28–30m/s
Internal average wind speed: ≥18m/s, uniformity deviation ≤5m/s (anti-dead corners)
Filter efficiency： H13 (≥ 99.9%@0.3μm) or H14 (≥ 99.97%@0.3μm)
3. Size and passage method (compatible with the number of people and space)
1) Conventional size (width × depth × height， mm)
Single person single air shower： 800×800×2000 (1 person / time， small workshop)
Double person double air shower： 1200×800×2000 (2 people / time， medium workshop)
Many people / passage： 1500×800×2000 or above (3–6 people / time， large workshop)
2) Door body and layout
Double door interlock： electronic + mechanical dual interlock (door closes during air shower， prevents gas leakage)
Door opening direction： single opening / double opening / sliding door (suitable for on-site movement)
Corner type： saves space (suitable for L-shaped corridors)
4. Material and explosion-proof electrical (safety and durability dual guarantee)
1) Box material (explosion-proof + anti-static + corrosion-resistant)
304 stainless steel： general use， anti-static， easy to clean (lithium batteries / pharmaceuticals preferred)
316 stainless steel： resistant to acid and alkali corrosion (chemicals / humid environment)
Anti-static cold-rolled steel plate： low cost， requires overall grounding (general explosion-proof area)
2) Explosion-proof electrical list (must be included)
Explosion-proof fan (flameproof motor， no spark impeller)
Explosion-proof PLC + explosion-proof switch + explosion-proof emergency stop button
Explosion-proof infrared sensor + explosion-proof electromagnetic lock
Explosion-proof lighting (LED / fluorescent lamp) + explosion-proof junction box / wiring box
Anti-static nozzle (stainless steel / aluminum alloy， anti-friction spark)
5. Certification and manufacturer (key to avoiding pitfalls)
1) Required certifications Explosion-proof Certification: GB 3836 (Classified Explosion-proof), GB 12476 (Dust Explosion-proof), with explosion-proof certificate
Cleanliness Certification: GB 50073, ISO 14644, supports PAO leak detection
Material Certification: Stainless steel material report, anti-static grounding test report
2) Manufacturer Screening
Has explosion-proof equipment production qualification, not an ordinary air shower room modification
Provides explosion-proof drawings + electrical schematic diagram + factory test report
Can conduct on-site explosion-proof grounding test + air velocity uniformity test
Six. Selection Decision Checklist (Directly check corresponding items)
Dangerous Area: □Zone1 (Ex d IIB T4) □Zone2 (Ex d IIB T4)
Cleanliness Level: □ISO5–6 (H14/28m/s) □ISO7–8 (H13/25m/s)
Size: □Single person 800×800 □Double person 1200×800 □Customized for multiple people
Material: □304 Stainless Steel □316 Stainless Steel □Anti-static Steel Plate
Electrical: □Full explosion-proof □Anti-static Grounding □Double-door Interlock
Certification: □Explosion-proof Certificate □Cleanliness Inspection Report □Material Certification
Seven. Common Pit Avoidance Reminders
❌ Convert ordinary air shower room to explosion-proof: Electrical not explosion-proof, poor grounding, explosion risk is extremely high
❌ Only focus on price: Ignore explosion-proof grade, air velocity uniformity, material thickness, and later safety / purification will both fail
❌ Ignore dust explosion-proof: Lithium battery / aluminum powder workshop needs to meet both gas + dust explosion-proof (Ex tD)
