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The California Air Resources Board has verified the Rypos
DPF/LETRU (Level 2 Plus) diesel particulate filter for use on
most trailer TRUs using 2002 and older model year engines. 

The California Air Resources Board (ARB) has verified the Rypos
DPF/LETRU (Level 2 Plus) diesel particulate filter, which can be
used to comply with the Low-Emission Transport Refrigeration Unit
(LETRU) In-Use Performance Standard on most trailer transport
refrigeration units (TRU) using 2002 and older model year
engines.  Compliance information related to the TRU Airborne
Toxic Control Measure is available at: 
http://www.arb.ca.gov/diesel/tru.htm
The Rypos DPF/LETRU consists of active flow-through filters made
out of an electrically conductive sintered metal fiber medium. 
It is microprocessor controlled with a backpressure control
system, an electrical control circuit, and a backpressure warning
indicator.  TRU owners should read about the specific conditions
for which the DPF/LETRU has been approved in the Executive Order
(EO), which has been posted on ARB’s Verification Procedure –
Level 2 webpage at
http://www.arb.ca.gov/diesel/verdev/level2/level2.htm.  Specific
engine models and families that apply are listed in the EO's
attachment, also listed at the above webpage.