Additional Resources Save and Share Click here for a list of retrofit products that the Environmental Protection Agency or the California Air Resources Board (CARB) has verified.

 

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The concept of “retrofit” has typically been defined broadly. While the term is frequently used as a label describing various exhaust emissions control devices such as the DOCs and particulate filters previously outlined, it can also encompass a broader range of options to reduce emissions, including re-powering, rebuilding and in some instances replacing existing equipment, as detailed below:

Rebuild. After 3 or 4 years, rebuilding some core engine components to manufacturers’ original specifications can return emissions performance to the original design levels. Some manufacturers also have options to improve emissions beyond the original performance levels.

Refuel. Use of Ultra-low Sulfur Diesel (ULSD) can lower emissions, as can some other renewable fuels and fuel products such as biodiesel and emulsifiers.

Retrofit. The installation of exhaust emissions control technologies such as particulate filters, oxidation catalysts, exhaust gas recirculation (EGR), selective catalytic reduction (SCR) devices, and lean NOx catalysts (LNCs).

Repower. Replacing the older engine in diesel powered equipment with a new or newer diesel engine can dramatically reduce emissions.

Replace. Replacing entire vehicles or equipment may be the best option for some of the oldest, heaviest emitting vehicles or equipment due to technological feasibility and cost considerations.

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