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The Air Resources Board conditionally verified the Caterpillar
Diesel Particulate Filter (DPF) as a Level 3 passively
regenerated diesel emission control system for use with
rubber-tired off-road equipment powered by certain off-road
diesel engines with model years between 1996 and 2008.  Approved
engines are certified to a particulate matter emission level
equal to or less than 0.2 grams per brake horsepower-hour, are
rated to at least 175 horsepower and less than 300 horsepower,
and are not equipped with exhaust gas recirculation systems. 
The Caterpillar DPF uses a cordierite wall-flow filter with an
upstream diesel oxidation catalyst for regeneration to achieve
an 85 percent reduction in emissions of diesel particulate
matter.  Specific conditions for which the Caterpillar DPF has
been approved may be found in the conditional verification
letter at http://www.arb.ca.gov/diesel/verdev/verdev.htm . 

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