An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Verified Technologies for SmartWay and Clean Diesel

Nett Technologies, Inc.—BlueMAX™ PLUS 100 Selective Catalytic Reduction (SCR) System

This retrofit technology is included on EPA's Verified Technologies List for Clean Diesel.

On this page:

Technology specifications

Engine Model/Application

Nonroad, 4-cycle engines, rated 100-750hp, certified to Tiers 1, 2, or 3

Retrofit Fuel, Max Sulfur 15 parts per million (ppm)
Reduction in particulate matter (PM) 85%
Reduction in nitrogen oxide (NOx) 85%
Reduction in hydrocarbons (HC) 60%
Reduction in carbon monoxide (CO) 95%

Top of Page

Criteria to achieve emission reductions

The following criteria must be met in order for appropriately retrofitted engines to achieve the aforementioned emission reductions:

  1. Baseline engine must be in a certified configuration and operating on fuel with less than 15 ppm sulfur.
  2. Exhaust temperature data logging will be performed before each installation, and exhaust temperatures must be above 325 degrees °C for at least 25% of the normal duty cycle. As there may be significant variations from application to application, Nett Technologies will review actual engine operating conditions and perform temperature data-logging prior to retrofitting an engine with the BlueMAX™ PLUS 100 system to ensure compatibility.
  3. Each installation will be equipped with a monitoring system that displays warning lights and error codes visible to the operator, providing urea tank level and diagnostic information.
  4. The engine/equipment must not be equipped with a crankcase oil burning system.
  5. The engine should be well maintained and not consume lubricating oil at a rate greater than that specified by the engine manufacturer.
  6. The engine must not have been originally certified or equipped with a DOC or diesel particulate filter (DPF).
  7. The DPF component of the system is recommended for service every 1000 hours of use.

Top of Page

Verification Letter from EPA

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.