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Verification Extension for the Donaldson LNF System for 
On-Road Diesel Vehicles
. 

The Air Resources Board (ARB) has completed an extension to the
verification of the   Donaldson Low NO2 Filter (LNF) Muffler
System for select 1993 through 2006 model year diesel engines
used in on-road applications.  All approved engines are
four-stroke, turbocharged, have certified oxides of nitrogen
emissions of 3.0 grams per brake horsepower-hour (g/bhp-hr) or
greater, and are certified to the 0.1 g/bhp-hr emission standard
for particulate matter (PM).  The LNF system employs a catalyzed
pre-filter and a catalyzed diesel particulate filter with a
backpressure monitor to achieve an 85 percent reduction in PM
emissions, qualifying it for Level 3 Plus verification.  Specific
engine families and conditions for which the LNF system has been
approved may be found in the Executive Order which will be posted
within ten days on ARB website at:
http://www.arb.ca.gov/diesel/verdev/verdev.htm.  


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