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Verified Nonroad Engine Technologies List

Key Topics: Technology

This table shows only diesel retrofit technologies approved for nonroad engines.
See the contact page for more information on these manufacturers.

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Main list

For a more widely applicable list read EPA verified diesel retrofit technologies.


EPA Verified Nonroad Engine Retrofit Technologies
Manufacturer Product Name/Technology Type Applicability Fuel Type Reductions (%)
PM NOx
Caterpillar, Inc. Diesel Particulate Filter Nonroad, 4-cycle, non-EGR equipped, model year 1996-2005, turbocharged engines with power ratings between 174.2 to 301.5 horsepower 15 ppm sulfur diesel 89 n/a
Caterpillar, Inc. Caterpillar Emissions Upgrade Group Select Caterpillar 3306 diesel engines for nonroad applications with model years from 1988 to 1995 with mechanical direct fuel injection, turbocharged with power ratings in 75 < Kilowatts < 130 (100 < horsepower < 174) 500 ppm sulfur diesel 22 >37
Lubrizol Lubrizol PuriNOx / Water Emulsion (Alternative) Fuel Heavy Duty, 2 & 4 Cycle engines Emulsified fuel with 2D having 500 ppm sulfur 16.8 to 23.3 17 to 20.2

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California Air Resources Board (CARB) Verified Nonroad Engine Retrofit Technologies
Manufacturer Product Name/Technology Type Applicability Fuel Type Reductions (%)
PM NOx
Catalytic Exhaust Products Ltd.  Dieselytic SXS-SC DPF Stationary prime and emergency standby generators and pumps with Tier 1, Tier 2, or Tier 3 certified off-road engines ≤ 0.2 g/bhp-hr diesel PM 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
Caterpillar, Inc. DPF Specific 1996-2008 model years, off-road 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
Cleaire Lonestar Lean NOx Catalyst and DPF Conditionally verified for 1996 through 2009 model year, rubber-tired off-road vehicles 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) 40
CleanAIR Systems PERMIT Exit EPA Disclaimer DPF Stationary emergency and prime generators 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
DCL International Inc. Exit EPA Disclaimer DPF Conditionally verified for certain 1996-2008 model year nonroad engines 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
DCL International Inc. Exit EPA Disclaimer DPF Stationary prime and emergency standby generators; Tier 1, 2, or 3 off-road engines certified to ≤ 0.15 g/bhp-hr PM 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
Donaldson Exit EPA Disclaimer Donaldson / Series 6000 DOC + Crankcase Filter Off-road port equipment 15 ppm sulfur or biodiesel blend 25 (Level 1 Plus) n/a
Engine Control Systems Exit EPA Disclaimer Engine Control System Purifilter (High Load) / DPF Conditional verification for off-road for specific engines, model years 1996-2008 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
Engine Control Systems Exit EPA Disclaimer Engine Control System Combifilter / DPF 2007 or older off-road 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
Engine Control Systems Exit EPA Disclaimer Engine Control System AZ Purimuffler/Purifier / DOC + Alt fuel 1996-2002 off-road PuriNOx- emulsified diesel fuel  50 (Level 2 Plus) 20
Engine Control Systems Exit EPA Disclaimer Engine Control System AZ Purifier & Purifmuffler /  DOC 1996-2002 off-road 15 ppm sulfur or biodiesel blend 25 (Level 1 Plus) n/a
Extengine Transport Systems Extengine - Advanced Diesel Emission Control System (ADEC) / DOC + Selective Catalytic Reduction (SCR) Certain 1991-1995 Cummins 5.9-liter, 150 to 200 HP nonroad engines used in excavators, dozers, loaders, and utility tractor rigs 15 ppm sulfur or biodiesel blend 25 (Level 1 Plus) 80
HUSS Umwelttechnik GmbH Exit EPA Disclaimer HUSS Umwelttechnik FS-MK diesel particulate filter (DPF) with diesel fuel burner for regeneration Most on-road diesel engines through 2006 MY and most off-road through 2008 MY 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
Johnson Matthey Exit EPA Disclaimer Johnson Matthey CRT / DPF Stationary emergency/standby generators; conditionally verified for stationary prime generators 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
Miratech Corporation Exit EPA Disclaimer Miratech Corporation Combikat (DPF) Stationary emergency and prime generators with a PM emission rate ≤ 0.2 g/bhp-hr 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
Proventia Proventia FTF TM / FTF Most Thermo King trailer TRUs using 1985 through 2002 model year engines 15 ppm sulfur or biodiesel blend 50 (Level 2 Plus) n/a
Rypos Inc. Exit EPA Disclaimer Rypos, Inc. HDPF/C™ (Hybrid DPF) 1996-2007 stationary emergency standby generators and pumps with a PM emission rate ≤ 0.2 g/bhp-hr and certified to Tier 1, Tier 2, or Tier 3 off-road diesel engine standards 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
Rypos Inc. Exit EPA Disclaimer Rypos ADPF (DPF) 1996-2008 stationary engines (certified to Tier 1, 2, or 3 off-road PM emission level), no EGR, DOC or pre-existing DPF 15 ppm sulfur or biodiesel blend 50 (Level 2 Plus) n/a
Rypos Inc. Exit EPA Disclaimer Rypos, Inc. DPF/LETRU™ Most trailer TRUs using 2002 and older model year engines 15 ppm sulfur 50 (Level 2 Plus) n/a
Sud-Chemie, Inc. Exit EPA Disclaimer EnviCat-DPF™ diesel particulate filter (DPF) Stationary prime and emergency standby generators and pumps 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
Teleflex Teleflex Clear Sky DPF With the Comfort Pro APU, powered by select Kubota Z482 diesel engines with model years between 2005 and 2008 15 ppm sulfur or biodiesel blend 85 (Level 3 Plus) n/a
Thermo King Thermo King eDPF 2006-2008 Thermo King auxiliary power units 15 ppm sulfur 85 (Level 3 Plus) n/a
Thermo King Thermo King PDPF™ / FTF 1985-2002 transport refrigeration unit engines. Read the Executive Order for detailed engine matching requirements 15 ppm sulfur 50 (Level 2 Plus) n/a
Vycon REGEN System Exit EPA Disclaimer Energy Storage System Pre-1996 model year or Tier 1, 2, or 3 certified off-road diesel engines on rubber-tired gantry cranes 15 ppm sulfur or biodiesel blend 25 (Level 1 Plus) 30

CARB Verified Technologies are listed and explained at www.arb.ca.gov/diesel/verdev/verdev.htm.  Exit EPA Disclaimer

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Memorandum of Agreement (MOA) with California Air Resources Board (ARB)

EPA's Diesel Retrofit Program signed a Memorandum of Agreement (MOA) (PDF, 3 pages, 204KB, About PDF files) (June 2004) with the State of California Air Resources Board (ARB) for the Coordination and Reciprocity in Diesel Retrofit Device Verification. The MOA establishes reciprocity in verifications of hardware or device-based retrofits, and further reinforces EPA's and ARB's commitment to cooperate on the evaluation of retrofit technologies. This agreement commits EPA and ARB to work toward accepting particulate matter (PM) and oxides of nitrogen (NOx) verification levels assigned by the other's verification programs. Additionally, as retrofit manufacturers initiate and conduct in-use testing, EPA and ARB agreed to coordinate this testing so data generated may satisfy the requirements of each program. This MOA is intended to expedite the verification and introduction of innovative emission reduction technologies. Additionally, this MOA should reduce the effort needed for retrofit technology manufacturers to complete verification.

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