Among the multiple tiers of emissions standards issued by the U.S. Environmental Protection Agency (EPA), it’s the comprehensive Tier 4 emissions standards that have impacted the development of refrigeration units and led to the integration of engine and fuel controls. Also affecting refrigeration unit design is the California Air Resources Board (CARB) Airborne Toxic Control Measure (ATCM) for In-Use Diesel-Fueled Transport Refrigeration Units and TRU Generator Sets, and Facilities ...

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