The EPA's first set of emissions regulations affecting diesel engines in the horsepower ranges used by Miller had an effective date of January 1, 1998. Since then, increasingly stringent emissions regulations have been implemented. T2 became effective in 2004 and was followed by T3/T4i in 2008. In each case, both Miller and the engine manufacturers made the modifications necessary to ensure full compliance.
Miller has prepared for the T4F changes not only by ensuring full compliance of affected diesel engine-driven welder/generators, but also by increasing the output capabilities of welder/generators with diesel engines rated under 25 horsepower, which meet a different level of Tier 4 EPA regulations. In improving the full line of Miller® diesel-powered welder/generators, we hope to make more options available to our customers and minimize the impact that the T4F regulations may have on them.