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Unidirectionality Parts Changes for ECS’ Purifilter Plus,
Purifilter, and Combifilter Systems. 

The Air Resources Board (ARB) has approved design modifications
to Engine Control Systems’ Purifilter Plus, Purifilter, and
Combifilter Systems that allow them to comply with the
unidirectional installation requirement which is effective
January 1, 2010.  ARB has also added additional clarifications
to the Combifilter executive order and made corrections to the
associated engine family list.  The revised conditional
verification letter will be posted within 10 days on the ARB
website at: 
http://www.arb.ca.gov/diesel/verdev/verdev.htm


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