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Explosion-Proof Ventilation Fans

Explosion-Proof Ventilation Fans

Explosion-proof ventilation fans, also sometimes called spark-proof or sparkless ventilation fans, are a safe solution for environments that contain harmful gases, vapors, and dust. Any area that poses a risk for a fire or explosion due to combustible dust, vapors, flammable liquids, gases, or ignitable fibers in the atmosphere is considered a hazardous location. When electrical equipment is used in hazardous locations, there's a risk of an explosion or fire occurring. The construction of these spark-proof ventilation fans means that the parts of the fan that are in contact with the air stream are made of spark-resistant materials to reduce the risk of combustion.

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Where Are Explosion-Proof Ventilation Fans Used?

Sparkless ventilation fans are commonly used in locations such as:

  • Warehouses
  • Plants
  • Mills
  • Tanks and Silos
  • Spray Booths
  • Manufacturing Facilities

Hazardous Classifications

Which locations are considered hazardous? The National Electrical Code (NEC) considers hazardous locations to be areas where fire or explosion hazards may exist due to flammable gases or vapors, flammable liquids, combustible dust, or ignitable fibers or flyings.

There are three types of hazardous locations:

Class I Locations

A Class I location is created by the presence of flammable gases or vapors in the air in sufficient quantities to be explosive or ignitable. When these materials are found in the atmosphere, a potential for explosion exists if an electrical or other source of ignition is present.

Class II Locations

Class II locations are created by the presence of combustible dust in the air in sufficient quantities to be explosive or ignitable.

Class III Locations

A Class III location is created by the presence of easily ignitable fibers or flyings. Typically, these fibers and flyings are not suspended in the air but can collect around machinery or on lighting where heat, a spark, or hot metal can ignite them.

Visit the Occupational Safety and Health Administration (OSHA) to learn more.

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