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Verified Technologies for SmartWay and Clean Diesel

Nett Technologies, Inc. — GreenTRAP NOVA 100 Active Diesel Particulate Filter (DPF) System

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

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Technology specifications

Engine Model/Application

Non-road, 4-cycle, with or without EGR diesel engines between 175 – 470 hp (130 – 351 kw) ranges

Retrofit Fuel, Max Sulfur 15 parts per million (ppm)
Reduction in particulate matter (PM) 90%
Reduction in nitrogen oxide (NOx) 0%
Reduction in hydrocarbons (HC) 90%
Reduction in carbon monoxide (CO) 90%

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Criteria to achieve emission reductions

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

  1. The baseline engine must be in a certified configuration and operating on fuel with less than 15 ppm sulfur.
  2. The engine exhaust temperature must achieve at least 250°C for 25% of the duty cycle.  The active regeneration requires at least 250°C. If the engine exhaust temperature drops to below 250⁰C during or prior to regeneration, the active regeneration will be automatically stopped.
  3. When the exhaust temperature is above 300°C for more than 30% of the engine operating time, the DPF passively regenerates and active regeneration is not required.
  4. The engine should be well maintained and not consume lubricating oil at a rate greater than that specified by the engine manufacturer.
  5. The engine must not have been originally certified or equipped with a DPF or diesel oxidation catalyst (DOC) to EPA Tier 1, 2 or 3 standards.
  6. The GreenTRAP NOVA 100 monitoring system will display messages for DPF cleaning after 2,000 hours of run time. DPF ash disposal handling must be complied in accordance with all applicable federal, state and/or local regulations governing waste disposal.
  7. For constant speed engines in stationary applications, Nett Technologies Inc. is responsible for working with end-users in determining the engine’s eligibility and compliance with applicable federal, state, and/or local regulations. 

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Verification Letter from EPA

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