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Q. What is Tier 4 Final?
A. Tier 4 Final (T4F) is a significant reduction in the EPA's allowable levels of exhaust emissions from diesel (not gasoline) engines. To meet T4F regulations, new diesel engines require significant modifications, including the installation of exhaust after-treatment devices. The result will be fewer pollutants emitted by those engines and a cleaner environment.
Q. When will T4F regulations take effect?
A. Effective January 1, 2013, all newly manufactured diesel engines used in Miller equipment rated up to 75 horsepower for use in the U.S. or Canada must be T4F compliant.
Q. Are there any allowable exceptions to T4F implementation?
A. Yes. The EPA allows Original Equipment Manufacturers (OEMs) to use a limited number of diesel engines meeting the previous emissions standards, Tier 4 Interim (T4i). As an OEM, Miller Electric Mfg. Co. will be permitted to use a percentage of T4i engines in products. The date on which Miller will switch to T4F engines will be determined based on sales figures.
Q. Can diesel-powered equipment purchased before the T4F regulation effective date of January 1, 2013 be used after that date?
A. Yes. Diesel-powered equipment purchased before the T4F effective date will not be affected. Only Tier 4 Final diesel-powered equipment with engines manufactured after January 1, 2013 will be affected.
Q. Which Miller® diesel engine-driven welder/generators will be affected by T4F?
A. Miller® diesel engine-driven welder/generators affected by T4F include the Big Blue® 400, Big Blue® 400 Eco Pro, Big Blue® 500, Big Blue® 700 Duo Pro and Big Blue® AirPak.
Q. Are other countries adopting T4F standards?
A. Each country has its own emissions rules, but only the U.S. and Canada are adopting T4F standards at this time.
Q. How long has Miller known about these EPA regulations, and what has Miller done to prepare for them?
A. 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 effective date of January 1, 2013 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.

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