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Section 2706(r) of the Verification Procedure, Warranty and
In-Use Compliance Requirements for In-Use Strategies to Control
Emissions from Diesel Engines requires verified diesel emission
control strategies (VDECS) installed on or after January 1, 2010
that include an aftertreatment device such as a diesel
particulate filter, must be designed such that the aftertreatment
device can only be installed on the application in one unique
direction. In addition, any new aftertreatment device installed
in the period between February 19, 2009 and December 31, 2009
must indicate the proper direction of exhaust flow so the end
user can clearly see how to properly install the device.

Consistent with staff’s proposed changes to the Verification
Procedure that will be considered by the Air Resources Board
(ARB) at its January meeting, ARB staff will allow for a six
month “sell-through” period for VDECS that do not meet the
January 1, 2010 requirements of section 2706(r) regarding the
unidirectional flow requirements, provided that the VDECS meets
the following requirements:

•	Indicates proper direction of the exhaust flow through the
device (per the February 19, 2009 requirements of section
2706(r)),
•	Has a date of manufacture no later than December 31, 2009,
•	Is installed no later than July 1, 2010.

If you have any questions concerning this, please contact Ms.
Shawn Daley, Manger, at 626-575-6972 or by email to
sdaley@arb.ca.gov, or Mr. Juan Avila, staff, at 626-575-7098 or
by email to javila@arb.ca.gov.