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Tag Archives: Ventilation Fans

APPLICATIONS AND COMMON USES FOR EXPLOSION PROOF EXHAUST FANS

ventilations fans 1SKU #D1143684

Explosion-proof exhaust fans, or hazardous location fans, provide proper ventilation for spaces where flammable gases, vapors, or dusts may be present.  These fans are designed to be non-sparking, which minimizes the risk for sparks that could ignite potentially flammable materials.  For example, in an environment with flammable gases, if a non-explosion-proof exhaust fan were to tip over and hit against another metal object, a spark would very likely be emitted.  In the most at-risk locations, one spark is all it takes to cause an explosion.  Thus, the entire fan must be constructed with non-sparking materials, including aluminum or copper fan blades, and an explosion-proof motor.  An explosion-proof exhaust fan is a widely used piece of equipment in gas stations, chemical and metallurgy plants, and construction sites.

exhaust fan 2

FAN RATING SYSTEM

Each explosive-proof fan is marked with a specific code that provides vital safety information. When selecting an exhaust fan, refer to the fan’s safety code. Higher-risk work spaces require fans that meet safer standards, and using the wrong type of fan can be potentially hazardous.

These codes contain four pieces of information:  the classification standard (either American or Canadian), the protection concept code, the gas group, and the temperature code. This is a typical marking:

AEx t IIB T4

“AEx” means Explosion Protection, and it is the American standard classification code (the Canadian code is “Ex”). In addition, the “t” refers to the protection concept code, the “IIB” is the gas group, and “T4” indicates the temperature code.

exhaust fans 3

HAZARDOUS LOCATION CLASSIFICATIONS

A range of construction and industrial locations require the use of explosion-proof exhaust fans, and different types of ventilators to be used based on the facility’s explosion risk.  The fans are categorized into three class types that represent varying levels of risk:

  1. Class I

Class I locations are those in which flammable gases or vapors could be present in the air in quantities sufficient to produce explosive or ignitable mixtures.  These sites include paint spray booths, dry cleaning plants, and oil refineries.

exhaust fans 4

  1. Class II

The facilities in this classification have combustible dust that may be present in varying hazardous concentrations.  Among these locations are grain elevators and food powder processing plants. The risk for explosion in these facilities is greater than Class I, and the materials have lower ignition points.

exhaust fans 5

  1. Class III

Facilities in this class carry the highest risk and include locations like textile mills, cotton production plants, and woodworking facilities.  Class III hazardous locations contain easily ignitable fibers or flyings, but the concentration of these fibers or flyings are not suspended in the air in such quantities that would produce ignitable mixtures.

exhaust fans 6

Deelat.com is your source for high quality, safety-rated explosion-proof exhaust fans. Browse our extensive inventory of ventilation equipment which are now available at the best prices today!

Explosion-Proof Ventilation Fans: Applications and Common Uses

An explosion-proof ventilation fan, or hazardous location fan, is a widely used piece of equipment in industrial facilities and on construction sites. These specially designed fans provide proper ventilation for spaces where flammable gases, vapors, or dusts may be present. Explosion-proof ventilation fans are designed to be non-sparking, which minimizes the risk for sparks that could ignite potentially flammable materials. That means the entire fan is constructed with non-sparking materials, including an explosion-proof motor and aluminum or copper fan blades.

These fans have practical uses. For instance, if you were working in an environment with flammable gases, if the fan were to tip over and hit against another metal object, a spark would very likely be emitted. In the most at-risk locations, one spark is all it takes to cause an explosion. Hazardous location ventilation equipment is designed to reduce the risk for these sorts of accidents.

Phase Explosive Proof Portable Ventilator
Phase Explosive Proof Portable Ventilator

Locations That Require Hazardous Location Fans

A range of construction and industrial locations require the use of explosion-proof ventilation fans, and different types of ventilators should be used based on the facility’s explosion risk. For instance, woodworking facilities pose one of the greatest risks for explosion and fire. These facilities, in turn, require the safest equipment available.

There’s a complex classification for these fans, and they’re categorized into three class types that represent the risk factor for an explosion of a type of material. Materials with low ignition points pose the biggest threat, and are thus, grouped into Class III.

Class I facilities include dry cleaning plants, paint spray booths, and oil refineries, which are facilities in which the materials have high ignition points. Examples of Class II facilities include grain elevators, food powder processing plants, i.e. flour, sugar and cocoa, and fireworks manufacturing facilities. The risk for explosion in these facilities is greater, and the materials have lower ignition points. Finally, facilities with the highest risk are placed in Class III, include locations like woodworking facilities, cotton production plants, and textile mills.

Phase Explosive Proof Portable Ventilator - Side
Phase Explosive Proof Portable Ventilator – Side

Understanding Fan Rating System

Each explosive-proof fan is marked with a specific code that provides vital safety information. When selecting a ventilation fan, refer to the fans safety code. Higher-risk workspaces require fans that meet safer standards, and using the wrong type of fan can be potentially hazardous.

These codes contain four pieces of information: The classification standard (either Canadian or American), the protection concept code, the gas group, and the temperature code. A typical marking would look something like this:

Ex t IIB T4

“Ex” means Explosion Protection, and it is the Canadian standard for explosion-proof electronics. Alternatively, the American code is “AEx”. In addition, the “t” refers to the protection concept code, the “IIB” would be the gas group, and “T4” is the temperature code. These help differentiate the type of fan, and the safeguards against the material that is being handled.

There are four gas groups: I, IIA, IIB, and IIC. IIC is the gas group that poses the greatest risk for explosion or fire, and includes vapors like Hydrogen and acetylene. Fans that are marked IIC are suitable for IIB, IIA and I gas group environments.

Deelat.com is your source for high quality, safety-rated explosion-proof ventilation fans. Browse our extensive inventory of ventilation equipment available at the best prices today.