![]() ![]() Gases include acetone, ammonia, benzene, butane, ethanol, gasoline, methane, natural gas, naphtha and propane. d) Group D - Indicates flammable gases, liquid vapors or liquid vapor with an MESG of greater than 0.75 mm. Gases include ethyl ether, ethylene, acetaldehyde and cyclopropane. c) Group C - Indicates flammable gases, liquid vapors or liquid vapor with an MESG of greater than 0.45mm, but less than 0.75 mm. Gases include hydrogen, butadiene, ethylene oxide, propylene oxide, and acrolein. b) Group B - Indicates flammable gases, liquid vapors or liquid vapor with an MESG of less than 0.45mm. ![]() a) Group A - Indicates acetylene in the atmosphere. Groups A, B, C and D are referring to gases (Class I only), whilte Groups E, F and G are referring to dust particulates, fibers and flyings (Class II or III). Group is the determination of the type of hazardous material present in the surround atmosphere. b) Division 2 - Indicates that there is a low probability the the hazardous materials in a given area are susceptible to ignition or explosion due to its abnormal or short term presence in the atmosphere.ģ. a) Division 1 - Indicates that there is a high probability that the hazardous materials in a given area are susceptible to ignition or explosion due to its concentration in the atmosphere. Division determines the probability of the hazardous material, in question, producing an explosive or ignitable mixture based on its presence in the atmosphere. Class does not determine whether or not there are sufficient enough amounts of any of these above materials in the atmosphere to cause an ignition or explosion.Ģ. a) Class I - Areas where flammable gases, fumes or vapors are present b) Class II - Areas where combustible dusts are present c) Class III - Areas where ignitable fiber particulates are present. Class determines the nature of the hazardous material properties in the given atmosphere. This section is regarding Classifications, Divisions and Groups:ġ. Utilizes only a non-ferrous rubbing plate that is typically constructed of aluminum but can be constructed out of the aforementioned alternative materials when appropriate. The AMCA “C” spark resistant construction is the lowest degree of spark resistance. The AMCA “B” spark resistant construction is less protection that AMCA “A” construction, AMCA “B” construction consists of a non-ferrous wheel or bladed and non -ferrous rubbing plate around the hole through which the shaft passes. Typically aluminum is the non-ferrous material used here. Air-stream parts are constructed out of non-ferrous materials. The AMCA “A” spark resistant construction is the highest degree of spark resistance. They will either use an "A" rating (Type A), "B" rating (Type B), or "C" rating (Type C). Also, AMCA (Air Movement and Control Association) rates fans and blowers by spark resistance. The Class/Division system is based on Class, Division and Group. Here in the United States we use what is called the Class & Division system for classifying a hazardous area. Any time electrical equipment is used in this type of an area, there runs the risk of a fire or explosion occurring. What determines if an area has a Hazardous Location classification? Any area that poses a risk for a fire or an explosion, due to the gases, vapors, combustible dust, flammable liquids or ignitable fibers in the atmosphere carries the classification of a Hazardous Location. We offer brands such as Canarm Ltd., TPI Corp., Allegro Industries, National Fan Co., Triangle Engineering, Airmaster Fan, Schaefer Ventilation, and Soler & Palau We carry the largest collection of commercial and industrial explosion proof fans and blowers for hazardous locations in the industry. Withing the explosion proof ventilation category we carry Wall Exhaust Fans, Roof Exhaust Fans, Filtered Exhaust Fans, Filtered Supply Fans, Blowers, Duct Inline Exhaust Fans, Air Circulators Fans, Confined Space Ventilators & Portable Cooling Fans. Explosion proof fans or hazardous location fans and blowers are an essential part of a warehouse, plant, mill, spray booth, tank, confined space or any other area where ignitable fumes, gases or dust may be present. ![]()
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