Explosion-Proof Fan - Safety Selection Standards for Flammable and Explosive Environments

In flammable and explosive environments such as petrochemical plants, coal mines, spray painting workshops, and dust workshops, ordinary fans can generate electrical sparks or mechanical friction sparks during operation that may ignite explosive mixtures, causing serious safety accidents. Explosion-proof fans ensure safe operation in hazardous environments through special design and certification.

Importance of Explosion-Proof Fans

China Explosion-Proof Standard System

• GB 3836.1-2021: Explosive atmospheres - Part 1: Equipment for explosive atmospheres - General requirements
• GB 3836.2-2021: Explosive atmospheres - Part 2: Equipment by flameproof enclosure (Ex d)
• GB 3836.3-2021: Explosive atmospheres - Part 3: Equipment by increased safety (Ex e)
• GB 12476-2023: Electrical equipment for combustible dust environments

Xinfeng Fan explosion-proof fans are all certified by the National Quality Supervision and Inspection Center for Explosion-Protected Electrical Products (CQST), with explosion-proof mark Ex d IIB T4 Gb / Ex tD A21 IP65 T80°C.

Explosion-Proof Rating Explanation

Gas Explosion-Proof Ratings

Dust Explosion-Proof Ratings

Xinfeng Fan provides Ex d IIB T4 Gb and Ex tD A21 B20 T80°C certifications, covering 95%+ of industrial environments.

Core Design of Explosion-Proof Fans

1. Flameproof Enclosure (Ex d)

• Housing made of HT250 gray cast iron or 304 stainless steel casting
• Joining surface width ≥25mm, gap ≤0.15mm
• Pressure test 1.5x working pressure, no deformation or leakage

2. Explosion-Proof Motor

• YB3 series flameproof three-phase asynchronous motor
• Protection grade IP55, insulation grade F
• Temperature rise margin ≥15K, ensuring surface temperature does not exceed T4 group (135°C)

3. Anti-Static Design

• Impeller and housing insulation treatment, resistance value ≤10⁶Ω
• Grounding terminal ≥M8, grounding resistance ≤0.1Ω
• Cable entry device MT type explosion-proof sealing connector

4. Safety Interlock

• Emergency stop button (IP66 protection)
• Over-temperature protection (PT100 temperature sensor)
• Vibration monitoring (amplitude ≥4.5mm shutdown)

Applicable Environments and Selection

Selection Process

1. Determine explosive environment category (gas/dust)
2. Confirm gas/dust group and temperature group
3. Calculate required air volume and pressure
4. Select explosion-proof rating and material
5. Xinfeng provides explosion-proof fan technical solution

🏭 Xinfeng Fan has supplied 2,000+ explosion-proof fans to Sinopec, CNPC, Wanhua Chemical, and other enterprises with zero safety incidents.

Xinfeng Explosion-Proof Fan Products

XFZB Series Explosion-Proof Axial Fan

XFB Series Explosion-Proof Centrifugal Fan

XFYB Series Explosion-Proof Fire Smoke Exhaust Fan

Xinfeng Explosion-Proof Fan Advantages

Frequently Asked Questions

Q: How much more do explosion-proof fans cost compared to ordinary fans?

A: Due to special design and certification, explosion-proof fans cost 2-3 times more than ordinary fans. However, considering safety value, the investment return ratio is extremely high.

Q: How long is the explosion-proof certification valid?

A: The explosion-proof certificate is valid long-term but requires regular inspection. Xinfeng provides annual explosion-proof performance testing services.

Q: Can explosion-proof fans be used in corrosive environments?

A: Yes, Xinfeng provides 316L stainless steel explosion-proof fans that meet both Ex d IIB T4 and corrosion-resistant requirements.

Q: What is the delivery time for Xinfeng explosion-proof fans?

A: Standard explosion-proof models 15-25 days, special certification models 30-45 days. Urgent orders can be expedited.

Contact Us

Guangdong Xinfeng Fan Co., Ltd.

🛡️ Selection consultation → Solution design → Equipment supply → Installation & commissioning → Annual explosion-proof inspection