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Verification of the Donaldson SEF Muffler System for On-road
Applications. 

The Air Resources Board (ARB) has modified the verification of
the Donaldson Semi-Active Electric Filter (SEF) Muffler System
for diesel oxidation catalyst substrate change and emissions
device monitor Phase 1 upgrades for select 1991 through 2006
model year diesel engines used in on-road applications.  All of
these engines are four-stroke, turbocharged or naturally
aspirated, and were certified in California to the 0.25 grams per
brake horsepower-hour (g/bhp-hr) particulate matter emission
standard when new.  The SEF Muffler System employs a diesel
oxidation catalyst, heating element and an un-catalyzed diesel
particulate filter with a back pressure monitor to achieve an 85
percent reduction in particulate matter emissions, qualifying it
for Level 3 plus verification.  Specific engine families and
conditions for which the SEF Muffler System has been approved
along with the Executive Order will be posted within ten days on
ARB website at: 

http://www.arb.ca.gov/diesel/verdev/companies/donaldson/sef.htm



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