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Explosion Proof Fans

Explosion Proof Fans or Spark Resistant Fans?

In our industry, there can be some confusion regarding the difference between explosion proof fans and spark resistant fans, and how they differ. “Explosion proof” is a widely recognized term, often used to describe fans designed for hazardous environments where flammable gases, vapors, or dusts are present. It is, however, a non-specific, catch-all phrase that refers to equipment designed to prevent ignition-related incidents, aligning with safety standards like those from the National Fire Protection Association (NFPA) or the National Electric Code (NEC). Its intuitive appeal is likely why it is used so frequently among buyers, facility managers, and engineers who may not be deeply versed in technical distinctions.

“Spark resistant” is a more precise term, reflecting the Air Movement and Control Association (AMCA) standards (e.g., AMCA 99-0401) that classify fans based on their construction to minimize spark generation. This term is technically accurate, since no fan can be fully “explosion proof” due to its exposure to the airstream. It is often preferred by professionals familiar with regulatory compliance and engineering specifications.

Air Solutions offers a range of spark resistant fans designed to provide safe and reliable airflow in hazardous environments where flammable gases, vapors, or dust may be present.

PERFORMANCE RANGE

  • CFM (Airflow Capacity): Up to 150,000 CFM
  • Static Pressure: Up to 78” SPWG
  • Temperature Range: Standard designs up to 750°F; high-temperature designs available
  • Drive Types: Belt drive, direct drive, coupled drive, multistage drive
  • Material Types: Cast aluminum, stainless steel, high-temperature alloys, spark-resistant construction (AMCA Type A, B, or C)

Air Solutions is knowledgeable and experienced to assist you in selecting a fan for your specific project requirements including fans for potentially explosive environments. We offer you the added value of industry knowledge and a customer centered approach, focused on serving your application requirements.

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  • Selection Considerations
  • Types/Classifications
  • Applications

The type of construction that will best meet your explosion proof fan requirements depends upon the ambient location and application conditions to which your fan will be subjected. It is extremely important to select the right type of spark resistant construction for your application and the motor that is properly classified for your area. Key considerations include:

  • Compliance with Industry Standards – Ensure the fan meets ATEX, AMCA, UL, and NFPA safety requirements.
  • Airflow & Pressure Requirements – Match fan capacity with facility ventilation needs.
  • Material Selection – Choose non-sparking materials suitable for your hazardous classification.
  • Motor & Electrical Components – Explosion-proof motors and wiring prevent ignition risks.
  • Mounting & Installation Options – Ensure compatibility with existing ductwork and ventilation infrastructure.

The Air Movement and Conditioning Association (AMCA) has three classifications for “spark resistant” fans and blowers:

  • Type A – construction requires all materials of the fan or blower that are in contact with the air stream be comprised of spark resistant nonferrous material such as aluminum or brass
  • Type B – construction requires a nonferrous wheel and a rubbing ring around the hole where the fan or motor shaft enters the fan or blower housing
  • Type C – construction requires a nonferrous plate on both sides of the inside of the fan or blower housing

For more information on AMCA spark resistant construction, refer to AMCA 99-16, Section 8 available in AMCA Publication 99-16.

  • Chemical Processing Plants
  • Oil & Gas Refineries
  • Pharmaceuticals
  • Dust Collection & Combustible Dust Control
  • Wastewater Treatment Facilities
  • Paint Booths & Coating Applications
  • Food Processing & Grain Handling