Transport Refrigeration Unit (TRU or Reefer) ATCM

This page last reviewed March 13, 2013


trailer tru

Check TRU Compliance StatusThe public may use this link to search ARB’s Equipment Registration (ARBER) system to check the compliance status of TRUs and TRU generator sets and provide comments or provide tips on violations about specific TRUs. ARB will monitor these comments/tips and follow up with enforcement action, if warranted.  Or, you may report noncompliant TRUs to ARB's Complaint Hotline.

NEW! (February 28, 2013)  TRU Advisory 13-26 explains the new requirements that apply to dealers of TRUs, TRU generator sets, and TRU-equipped trucks and trailers.  It also explains the conditions that must be met by dealers to allow purchasing, selling, acquiring, possessing, and transporting noncompliant TRUs.  Other TRU advisories are also available at the "Advisories" link in the left-hand navigation panel of this page.

NEW! (February 28, 2013)  TRU Advisory 13-25 explains ARB's enforcement plan for the broker, forwarder, shipper, receiver, carrier, and driver requirements which became effective January 1, 2013, under ARB's TRU Regulation.  These requirements are needed to protect public health and ensure that TRU owners that have invested in cleaner equipment are not at a competitive disadvantage relative to noncompliant carriers.  Other TRU advisories are also available at the "Advisories" link in the left-hand navigation panel of this page.

NEW! (February 22, 2013)  Letter Template for Notice from Hiring Business Entity to Carriers Regarding New Requirements (Español):  The business entity (e.g. broker, forwarder, shipper, or receiver) that hires refrigerated carriers to transport perishable goods on California highways or railways should send a letter to the carriers they do business with, making them aware that the hiring business entity requires all of the refrigerated carriers they hire to comply with the TRU Regulation's in-use performance standards.  The notice would also say the hiring business entity now requires refrigerated carriers to:  1) certify to the hiring business entity that they (the carrier) will only dispatch TRUs that comply with the in-use performance standards; 2) register their TRUs in ARB's Equipment Registration (ARBER) system if they will travel on California highways or railways; 3) print out the ARBER certification page for each TRU; and 4) send those pages to the broker, forwarder, shipper, or receiver.  These points are all addressed in the letter template provided in the above link (or cut and paste this web address into your browser:  http://www.arb.ca.gov/diesel/tru/documents/template_notice_to_carriers.pdf .  More detailed discussion about these letters and when to send them is now included at Item #11.A. in the recently updated Guidance for Brokers, Forwarders, Shippers, Receivers, Carriers, and Drivers on Hiring and Contracting TRU-Carrier Transport of Perishable Goods on California Highways and Railways (Español).  

New! (February 20, 2013)  New TRU Models that Meet the ULETRU In-Use Performance Standard.  
TRUs that meet the ULETRU In-Use Performace Standard have no further in-use standard requirements.  
Currently, ONLY the Thermo King Precendent S-Series models meet ULETRU, which include the S-600 and S-600M
This list will be updated when additional new TRU models that meet ULETRU are introduced to the market.  
CAUTION:  Current TRU models equipped with less than (<) 25 horsepower (HP) engines do NOT meet ULETRU and therefore have a ULETRU compliance deadline at seven years.  TRU Advisory 12-22 explains the compliance requirements and options for <25 HP TRU engines.

New! (January 18, 2013)  TRU Tutorial for Broker, Forwarder, Shipper, Receiver, Carrier, and Driver Requirements.  Tutorial slides with notes below each slide to explain the new requirements for freight brokers, forwarders, shippers, receivers, carriers, and drivers that went into effect January 1, 2013.  These PowerPoint slides are based on ARB's Guidance for Brokers, Forwarders, Shippers, Receivers, Carriers, and Drivers on Hiring and Contracting TRU-Carrier Transport of Perishable Goods on California Highways and Railways. (Español)

New! (January 3, 2013)  TRU Compliance Check Resources for Carriers, Brokers, Forwarders, Shippers, and Receivers.  This webpage provides optional links for determining the compliance status of a TRU or company that owns TRUs. There are links to the ARBER Login Page, Public TRU Compliance Search Page, and TRU 100 Percent Compliant-Carrier Report Page in one convenient location to facilitate quicker navigation.  TRUs and carriers that are based outside of California may not be included depending on whether they have voluntarily chosen to register TRUs in ARBER.  In addition, companies will not be included on the TRU 100 Percent Compliant-Carrier Report if they have non‑compliant units, or if the TRUs they operate are owned by another business entity, such as a lessor, parent company, or holding company. 

Guidance for Electric Standby and Hybrid Electric Alternative Technology compliance strategies (together referred to as E/S).  This guidance explains how E/S must be used to qualify as an Alternative Technology and the recordkeeping and reporting that is required with this compliance option.  In addition, the automated recordkeeping and reporting requirements, using electronic tracking systems (ETS), that are phased in, beginning January 1, 2013, are explained.  Specifications are explained for businesses interested in providing ETS to E/S-equipped TRU owners.  ARB's ETS Supplier List is available, but users are warned that the list is not intended to imply ARB endorsement of any kind.  Users of this list are advised to use due diligence in evaluating offerings from the companies on this list.

TRU Advisory 12-24 explains issues related to purchasing transport refrigeration units (TRU) equipped with flexibility engines after Tier 4 Final (Trier 4f) new engine standards for 25 to 50 horsepower engines goes into effect in 2013.  Buyers should be aware that flexibility engines don't meet Tier 4f or ULETRU, so compliance is still required seven years after the flexibility engine's effective model year.  The effective model year for a flexibility engine that only meets Tier 4i is always 2012, so ULETRU must be met by the end of 2019.  There is an exception to this for TRUs manufactured in 2013 because there is only one year difference between the TRU's manufacture year and the engine's effective model year (these must meet ULETRU by the end of 2020).  For TRUs manufactuered after 2013 with flexibility engines, the life of the TRU is affected by the flexibility engine's 2012 effective model year.  TRUs manufactured in 2014 and later must meet ULETRU by the end of 2019, if they are equipped with flexibility engines.  So, TRU fleet managers need to be aware of this when they begin making TRU purchase plans in 2013 and later.  

2011 Amendments.  The 2011 Amendments were approved by the Office of Administrative Law and became effective October 15, 2012.  Current amended TRU Regulation (with changes incorporate).  Rulemaking documents are at ARB's TRU ATCM 2011 Regulatory Activity webpage.

100 Percent-Compliant Carrier List.  Query ARBER to view or download a report listing carriers that have registered TRUs in ARBER that are all compliant with the TRU Regulation’s in-use standards, based on current information in the ARBER database. 100 percent compliant means that all TRUs that are registered in ARBER are compliant with California's TRU regulation's in-use standards at the time of the report. Companies will not be included on this list if they have noncompliant units, or if the TRUs they operate are owned by another business entity, such as a lessor, parent company, or holding company.  Additionally, carriers based outside of California may not be included depending on whether they have voluntarily chosen to register.  Please also be aware that a company's compliance status may change when a compliance deadline passes or when an owner brings its TRUs into compliance. Listings are available in both PDF and CSV format. CSV format allows the listing to be sorted easily. Complete lilstings of all 100 percent-compliant carriers are available, or you may also query ARBER for a narrowed list of 100 percent-compliant carriers, by city, county, or state/province.

Guidance for Freight Brokers, Forwarders, Shippers, Receivers, Motor Carriers, and Drivers:  Hiring and Contracting TRU-Carrier Transport of Perishable Goods on California Highways  (Español).  Beginning January 1, 2013, California law will require the business entity that arranges, hires, contracts for, or dispatches TRU-equipped trucks, trailers, shipping containers, or railcars for transport of perishable goods on California highways and railways to require the motor carriers to dispatch only TRUs that comply with the TRU Regulation.  This guidance explains these requirements in detail and provides guidance on how to ensure motor carriers are compliant.  One option for carrier-hiring business entities is to use ARB's 100 Percent-Compliant Carrier List.

TRU Compliance Extensions

Compliance extensions are available if delivery or installation is delayed through no fault of the owner.  To qualify, an applicant must demonstrate, with documentation, that they made a good-faith effort to comply by December 31st of the applicable compliance year by ordering compliance equipment early enough to take into account delivery, installation, holiday, and year-end lead times.  We recommend that owners research compliance options in June and place orders in July to avoid delays.

Purchase order deadlines apply:

  • Replacement engines, units, and vehicles:  No later than August 31st of applicable compliance year
  • VDECS Retrofits (diesel particulate filters):  No later than October 31st of applicable compliance year
              Earlier orders are recommended because the maximum extension allowed by law is four months.

Compliance extension application (with documentation) deadline:  Close of business, December 31st.  Application Form

TRU ATCM 2011 Amendments

The California Air Resources Board (ARB or Board) approved amendments to the Transport Refrigeration Unit (TRU) Airborne Toxic Control Measure (ATCM) on October 21, 2011.  The current amended TRU Regulation (with changes incorporate) became effective October 15, 2012.  The amended Final Regulation Order (with changes delineated), Staff Report: Initial Statement of Reasons for Rulemaking, Notice of Public Hearing, and other regulatory documents are available at ARB's TRU ATCM 2011 Regulatory Activity webpage.

TRU ATCM 2010 Amendments

The Board adopted amendments to the Transport Refrigeration Unit (TRU) Airborne Toxic Control Measure (ATCM) on November 18, 2010.  These amendments became effective March 7,  2011.  TRU Advisory 10-20 explains what owners  need to do as a result of the 2010 amendments.

Background

Transport Refrigeration Units (TRUs) are refrigeration systems powered by diesel internal combustion engines designed to refrigerate or heat perishable products that are transported in various containers, including semi-trailers, truck vans, shipping containers, and rail cars. Although TRU engines are relatively small, ranging from 9 to 36 horsepower, significant numbers of these engines congregate at distribution centers, truck stops, and other facilities, resulting in the potential for health risks to those that live and work nearby. Since diesel particulate matter has been identified as a toxic air contaminant, the ARB adopted an Airborne Toxic Control Measure (ATCM) for TRUs and TRU generator sets on February 26, 2004. Please see more information about this rulemaking is at:  2004 TRU ATCM Rulemaking.  Key terms:  transport refrigeration unit, TRU genset, reefer, refrigerated truck, refrigerated trailer, refrigerated railcar, refrigerated shipping container.

Contact Us

Those interested in receiving more information may contact TRU ATCM at toll-free helpline -- 888-TRU-ATCM (888-878-2826).
Click on this link to sign up for the TRU listserve: TRU Listserve.

Compliance Schedule

July 31, 2009 All California-based TRUs must be registered with ARB.  Initial Operator Report must also be submitted by this date.
August 2009 ARB staff began field enforcement for registration of all California-based TRUs.
December 31, 2009 Model year (MY) 2001 and older and MY 2002 engines must meet the Low-Emission TRU (LETRU) In-Use Performance Standard.
January 2010 In-Use Performance Standard enforcement began.
December 31, 2010
 MY 2003 engines must meet either LETRU or the Ultra-Low-Emission TRU (ULETRU) In-Use Standard (Enforcement begins March 31, 2011)
December 31, 2011
 MY 2004 engines less than 25 hp must meet LETRU or ULETRU.  MY 2004 engines 25 hp and greater must meet ULETRU
December 31, 2012
 MY 2005 engines must meet ULETRU.
December 31, 2013
 MY 2006 engines must meet ULETRU.
December 31, 2014
 MY 2007 engines must meet ULETRU.
December 31, 2015
 MY 2008 engines must meet ULETRU.
December 31, 2016
 MY 2009 engines must meet ULETRU.
December 31, 2017
 MY 2010 engines must meet ULETRU.  MY 2003 engines that met LETRU on 2010 must meet ULETRU
December 31, 2018
 MY 2011 engines must meet ULETRU.  MY 2004 less than 25 hp engines that met LETRU on 2011 must meet ULETRU
December 31, 2019
 MY 2012 engines must meet ULETRU.

Please be aware that 30 days after compliance with the in use performance standards, compliance information must be entered into ARBER for each California-based unit. Operator Reports for California terminals where TRUs operate must also be updated to add new IDNs within 30 days of the unit coming under the control of the operator.  IDNs must be affixed to both sides of the TRU housing (see TRU Advisory 08-10) within 30 days of receipt.

Additional information is available in TRU Advisory 08-15.

Registration Applications for ARB Identification Numbers

If your TRUs are based in California, you were required to register your TRU with the California Air Resources Board. The deadline for registration of existing units was July 31, 2009.  New units must be registered within 30 days of the unit coming into the control of the owner. You are strongly encouraged to apply for California Air Resources Board Identification Numbers (IDN) electronically, on the Internet, using the Air Resources Board's Equipment Registration (ARBER) system, since this is the fastest way to register. If you are the owner of a TRU that is based outside of California, applying for an IDN is voluntary and there is no deadline.


Electronic Registration Instructions and Help Page: Please start at the ARBER System Requirements webpage to make sure your computer system is compatible, specifically, that your web browser is the latest version. Update your browser. Then, read and follow the instructions at the following link:  ARBER TRU Registration Help Page.

Electronic Registration Login: Login to complete online electronic applications for ARB Identification Numbers (IDN): ARBER Login Information submitted must be true, accurate, and complete.  Within 30 days of a change in ownership or compliance status, the new information must be entered in the ARBER system. This includes updates to the company profile and primary contact information.  Failure to report updates or submittal of false information is a violation of state law subject to civil and criminal penalties.

Manual IDN Application (Registration) Forms: You may fill out manual IDN applications, but this is not the recommended way to register TRUs because it will take much longer to process these applications.  Again, the electronic registration process is recommended (see above).  If you do not have a computer with Internet access, we recommend that you find a friend or relative that does. Get together at a computer and call the toll-free TRU Help Line at 1-888-878-2826 and ARB staff will walk you through the on-line IDN application/registration process.  If there is no way that you can apply for IDNs electronically, click on the ARBER TRU IDN Manual Application instructions page, print out the instructions, and download the two forms you'll need from that help/instruction webpage (forms #29 and #30).  It takes up to 30 days to get IDNs when you submit manual applications. Submit these forms by mail to the address shown on the forms. (If you own or lease terminals in California where TRUs are garaged, maintained, operated, or dispatched, see Operator Reports, below.)

Carrier Transicold has provided a compliance assistance document to help TRU owners find the Carrier TRU unit and engine labels and the information on those labels that is needed to apply for an ARB Identification Number.  The document is titled "Carrier TRU Reporting for ARB Equipment Registration (ARBER) ." Click on this link: Carrier Unit and Engine Label for ARBER. This provides helpful pictures showing where to look for the Carrier unit labels and Kubota engine labels. It also shows pictures of where to look on the unit label for the unit model, model year, and serial number.  There are also pictures showing where to look on the engine label to find the engine manufacturer, model, model year, and serial number.  Finally, it directs the user to contact their Carrier Transicold dealer if they need further assistance. Links to this document have been added to the ARBER TRU IDN Application Help Page (instructions).

Thermo King has provided a compliance assistance document to help TRU owners find the Thermo King TRU unit and engine labels and the information on those labels that is needed to apply for an ARB Identification Number.  This Thermo King document is titled "Service Bulletin TT503: ARB Equipment Registration (ARBER) Model and Engine Information." Click on this link: Thermo King Unit and Engine Label for ARBER. This provides helpful pictures showing where to look for the Thermo King unit labels and Isuzu or Yanmar engine labels. It also shows pictures of where to look on the unit label for the unit model, model year, and serial number.   There are also pictures showing where to look on the engine label to find the engine manufacturer, model, model year, and serial number. If you cannot find the unit and engine information needed to complete your registration, you are directed to contact your Thermo King dealer for further assistance.  Click on the "Dealer Locator" link at Thermo King's website. Links to the Thermo King Unit and Engine Label for ARBER document have been added to the ARBER TRU IDN Application Help Page (instructions).

Thermo King has provided a compliance assistance document to help TRU owners determine the model year of Isuzu engines.  Thermo King Service Bulletin TT505 provides a look-up table that uses the engine serial number to determine the engine model year.

Batch Uploads: The ARBER Administrator is also accepting electronic batch uploads of IDN applications. This process will allow TRU owners to transmit hundreds to thousands of registrations in one file for processing ARB IDN applications and Operator Reports.  You will need a programmer very experienced in XML programming to prepare the file. Please see the Batch Upload Help Page for details. If you do not have the appropriate technical skills in-house and are only planning to submit a small number of registrations, we highly recommend that you use the ARBER electronic registration system (see above).

If you have any questions on the ARBER registration system, please send an email or call the TRU Help Line at 1-888-878-2826.

Operator Reports

Please apply for IDNs or obtain them from your leasing agent prior to attempting an Operator Report.

If you operate a terminal in California where you garage, maintain, operate, or dispatch TRUs, you must comply with the Operator Report requirements of the TRU ATCM.  Currently the ARBER system does not accept Operator Reports without inputting at least one ARB Identification Number (IDN).  ARBER will not issue an IDN for a noncompliant engine. You must update your Operator Report within 30 days of receiving your IDN.

Electronic Operator Report Instructions and Help Page: Click on the following link: ARBER TRU Operator Report Help Page

Electronic Operator Report Login: Login to complete online electronic Operator Reports: ARBER Login

Manual Operator Reports: Manual Operator Report Form (form #33), Terminal Information Form (form #34), and Operator Report Instructions can be downloaded from the TRU Manual Operator Report and Terminal Information Help Page. Print out the instructions and download the two forms from that help/instruction webpage.  Follow the instructions and submit these forms by mail to the address shown on the forms.

If you have any questions on the ARBER Operator Reports, please send an email or call the TRU Help Line at 1-888-878-2826.

Compliance Assistance

Control Technology Options for Complying with the TRU ATCM: View the list of currently available compliance technology options for the TRU ATCM's In-use Performance Standards.  The December 31, 2011, compliance deadline for model year 2004 and older TRU engines has passed. ALL noncompliant TRUs will be cited and penalties up to $1,000 per unit will be assessed.  There is no allowance for late ordering.  Orders should be placed four months before a compliance deadline to account for normal lead times, which must take into account delivery from control technology supplier, installation, holiday season delays, and higher year-end demand at supplier and installer due to impending compliance deadline.

ARB's Course #512 covers all of ARB's diesel engine regulations, including the TRU ATCM.  Sign up for this course.  Print out Course #512 slides.  Video of Course #512 - just start the video and then click on the regulation of interest on the left navigation bar (scroll down to see the Transport Refrigeration Units listing and related subjects).

How Do I Comply with the TRU ATCM? - Revised April 28, 2009. This document provides logic flow charts and references to assist with TRU ATCM compliance. ( Español)

  • In-Use Performance Standards (see page 4)
  • Registration applications for ARB Identification Numbers (see page 7)
  • Operator Reports (see page 8)

Frequently Asked Questions and Guidelines for Compliance with the TRU ATCM - Revised April 28, 2009. This document provides guidelines for compliance in a question and answer format.  (Español)

TRU ATCM Advisories

All advisories can be reviewed on the TRU ATCM Advisories page.

Third Party Agreement Forms

TRU ATCM Third Party Agreement Confirmation Form for LEASED Units: This form may be used by an owner (lessor), that conveys the use of their transport refrigeration unit (TRU) and TRU generator set by lease agreement to an operator (lessee), to delegate the TRU ATCM responsibilities for equipment registration to the lessee.  See TRU ATCM Advisory 08-04 for more details.

TRU ATCM Third Party Agreement Confirmation Form for CONTRACTORS/CONSULTANTS: This form may be used by an owner (lessor), that conveys the use of their transport refrigeration unit (TRU) and TRU generator set by lease agreement to an operator (lessee), to delegate the TRU ATCM responsibilities for equipment registration to a third part contractor or consultant.

Compliance Assistance Contacts

TRU ATCM Compliance Option Contacts: A list of companies that may be able to provide compliance options to TRU owners for complying with the TRU ATCM is now available.  This list includes verified diesel emission control strategy (VDECS) manufacturers, dealers, and installers as well as an engine rebuilding company. Your local TRU dealer may also be able to help you evaluate compliance solutions. Companies and trade names mentioned on this list do not imply California Air Resources Board endorsement. This list may be revised periodically as additional companies are identified.


Financing Options for TRU ATCM Compliance:  Revised December 23, 2009.  A list of companies that offer financing for compliance with the TRU ATCM.  Also, grant programs are listed that may be able to assist qualified applicants.

Public Health Information

General Information

Rulemaking and Final Regulation Order with 2010 Amendments - The formal regulatory development documents for the 2010 Amendments and the regulation in effect as of March 7, 2011.

Rulemaking for original regulation adopted in 2004 - The formal regulatory development documents for the original rule.

TRU Listserve - To learn how to sign up for the TRU listserve.

Refrigerant Disposal - To learn about federal requirements (section 608 of the Clean Air Act) for recovery and recycling of ozone depleting refrigerants during servicing and disposal of TRUs.

TRU Verified Diesel Emission Control Strategy (VDECS) Information

VDECS Installation/Maintenance Information: Provides guidance to end users of VDECS who are interested in purchasing VDECS to comply with the TRU ATCM.  Links are provided to lists of installers, information documents about proper installation and maintenance of VDECS, ash handling, and related advisories. VDECS Course 511 Training

Managing Hazardous Waste from VDECS - ARB prepared this Guidance Document to assist end-users who own, operate, or maintain VDECS to manage ash generated by VDECS or the disposal of spent VDECS.

Level 3 VDECS (85 percent PM control) - meets ULETRU:
HUSS MK 35 and MK 50 DPF (formerly designated as the FS‑MK 40S and the FS‑MK 50S) has been verified as Level 3+ diesel emission control strategy for use with 1998 and newer diesel Transport Refrigeration Unit (TRU) engines.  It is capable of reducing emissions of particulate matter (PM) by 85 percent or more.  The HUSS MK 35 and MK 50 DPF consist of an active exhaust filter system and an automatic filter regeneration system.  The system has three modules with silicon carbide filter material that uses a diesel burner for regeneration.  Specific conditions for which the MK 35 (for 0 to 25 hp TRU engines) and MK 50 (for 26 to 50 hp TRU engines) DPF has been approved may be found on the ARB's Verification Procedure - Level 3 website within several days. See Huss, LLC's webpage for more information.

Huss LLC's "kit" for installing their MK-35 and MK-50 diesel particulate filters (DPF) on bobtail TRUs has been approved.  Huss MK series DPFs use active regeneration to burn off the collected diesel soot.  This allows the filter to be mounted away from the engine, if necessary.  Since there is not enough space in the TRU housing to mount the Huss DPF, a frame-rail mount, under the refrigerated van, was evaluated and approved.  This mounting configuration meets all of the conditions in ARB's verification Executive Order for MK-35 and MK-50 DPFs.  Temperatures around the DPF and exhaust tubing, and the integrity of the installation have been monitored and approved.  The Huss MK-35 and MK-50 DPFs reduce diesel particulate matter emissions by greater than 85 percent (verified to meet  Level 3), which means they can be used as an Ultra-Low-Emission TRU (ULETRU) in-use performance standard compliance option for bobtail TRUs.  See Huss, LLC's webpage for more information.

Rypos DPF/ULETRUTM has been verified as a Level 3+ diesel emissions control strategy to comply with the Ultra-Low-Emission TRU (ULETRU) in-use perfomance standard on single temp trailer TRUs using 2003 and newer model year engines manufactured by Kubota and Yanmar.  The DPF/ULETRU consists of flow-through filters made out of electrically conductive sintered metal fiber medium.  The system uses active electric resistance regeneration to control backpressure.  Warning indicators notify the operator when service is necessary.  Interested parties should read the Executive Order, which has been posted on ARB's Verification Procedure - Level 3 webpage.  Compatible engine models and families are listed in the attachment on that webpage.  See the Rypos website for more information.

Level 2 VDECS (50 percent PM control) - meets LETRU:

Proventia's FTFTM Level 2 Plus (greater than or equal to 50 percent reduction in PM plus complies with the 20 percent NO2 limit before January 1, 2009) flow-through filter verification allows this VDECS to be used to comply with the Low-Emission TRU In-Use Performance Standard (LETRU).  The FTF is verified for use on most Thermo King trailer TRUs using 25 to 50 horsepower, 1985 through 2003 model year engines of the following engine models:  Isuzu D201, Yanmar 4TNE82-TK and -ETK, and Yanmar 4TNE86-TK and –ETK.  The Proventia FTFTM consists of a catalyzed knitted wire mesh flow-through filter with backpressure control system, an exhaust system insulation package, and a backpressure warning indicator. TRU owners should read about the specific conditions and engine families for which the FTFTM has been approved in the Executive Order which has been posted on the ARB website for Level 2 VDECS. For more information contact Proventia Americas LLC, 1-800-609-7686.


Proventia Group's Bobtail FTFTM has been verified as a Level 2 Plus flow-through-filter to reduce diesel particulate matter at least 50 percent, plus complies with the 20 percent NO2 limit.  This verification allows this VDECS to be used to comply with the Low-Emission TRU In-Use Performance Standard (LETRU).  The Bobtail FTFTM is verified for use on most Thermo King truck TRUs using less than 25 hp, 1987 through 2004 model year engines of the following Yanmar engine models:  3TNE66-TK, 3TNE66KC-ETK, 3TNE72-TK, and 3TNE72KC-ETK. The Bobtail FTFTM is also verified for use on Carrier Transicold truck TRUs using less than 25 hp, 1994 through 2004 model year engines manufactured by Kubota with the following engine models: D722, D1105, D722-E, and D1105-E.  The Proventia Bobtail FTFTM consists of a catalyzed knitted wire mesh flow-through filter with backpressure warning indicator. TRU owners should read about the specific conditions and the specific engine families for which the Bobtail FTFTM has been approved in the Executive Order which has been posted on the ARB Verification Procedure - Level 2 website. For more information contact Proventia Americas LLC, 1-800-609-7686.


Rypos DPF/LETRU TM (Level 2 Plus) diesel particulate filter, has been verified to comply with the Low-Emission TRU (LETRU) In-Use Performance Standard on most trailer TRUs using 2003 and older model year engines manufactured by Isuzu, Kubota, and Yanmar.  The Rypos DPF/LETRUTM 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, which has been posted on ARB's website for Level 2 VDECS. Specific engine models and families that apply are listed in the EOs attachment, also listed at this webpage. See Rypos, Inc.'s website for more information.


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