The California Air Resources Board (ARB) has extended the verification for the Proventia Group’s FTF and Bobtail FTF to cover model year (MY) 2003 transport refrigeration unit (TRU) engines.

This action was taken in anticipation of ARB’s planned amendment to the TRU Airborne Toxic Control Measure (ATCM), which will change the in-use performance standard for MY 2003 engines from the Ultra-Low Emission TRU in-use performance standard to the less stringent Low-Emission TRU (LETRU) in-use standard.  MY 2003 TRU engines are required to comply with this in-use standard by December 31, 2010.

The Proventia FTF and Bobtail FTF flow-through filters reduce diesel particulate matter emissions at least 50 percent, plus they comply with the 20 percent NO2 limit, qualifying it as a Level 2 Plus Verified Diesel Emissions Control Strategy (VDECS).

This verification allows the FTF and Bobtail FTF Level 2 VDECS to be used as a retrofit compliance option to meet the TRU ATCM’s LETRU in-use standard.  It can be used on Thermo King TRUs with MY 1987 through 2003 truck TRU engines and MY 1985 through 2003 trailer TRU engines, provided certain terms and conditions are met.  TRU owners should read about the specific terms and conditions for which the Proventia FTF and Bobtail FTF have been approved in Executive Order DE-08-001-04, which will be posted the week of July 19, 2010, on the ARB Verification Procedure – Level 2 website at  The list of engines that can be matched with this filter will also be posted there as an attachment.

Additional information is available at: