Tier 4 Final Engines: Considerations for Fuel, DEF, Exhaust After-Treatment, and Regeneration

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In 2004 the Environmental Protection Agency (EPA) signed the final rule introducing Tier 4 emission standards. The goals of the regulation are designed to preserve and improve health, but the rules also impact businesses making, selling, servicing, and purchasing portable air compressors and a wide range of other equipment with affected diesel engines. 

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