T4F Home | MillerWelds

Tier 4 Final

Cleaner Equipment, Cleaner Air


Tier 4 Final (T4F) is the latest set of EPA emissions standards for diesel engines. T4F has resulted in cleaner, more-powerful diesel engines.

Understanding the Impact of T4F

A commitment to a cleaner world

Miller has redesigned its diesel engine-driven welder/generators to reduce emissions and maximize power output. The result is a full product lineup of exceptionally clean and powerful diesel engine-driven welder/generators.

New engines, new equipment

To comply with the new T4F regulations, manufacturers have extensively modified their engines. These new engines power a select group of Miller® welder/generators in our Big Blue® product line.

Get the right equipment for the job


Miller offers solutions for both large and small jobs, including higher-horsepower machines that are subject to T4F regulations, as well as machines with less than 25 horsepower, which comply with different EPA regulations.