California Air Resources Board

Note: Verifications are issued chronologically. The most recently issued Executive Order or individual attachment is the one which is currently in effect and is listed below each manufacturer’s verification. The most recent Executive Order supersedes any previous Executive Orders for the same product. Should you wish to view any previous Executive Orders or attachments for reference purposes related to a manufacturer’s verification, please view the associated link below each description.

CARB has verified the Donaldson Semi-Active Electric Filter (SEF) Muffler System for specific 1991 through 2006 model year diesel engines used in on-road applications. All of these engines are four-stroke, turbocharged or naturally aspirated, and were certified in California to the 0.25 gram per brake horsepower-hour (g/bhp-hr) particulate matter (PM) emission standard when new. The SEF Muffler System employs a diesel oxidation catalyst, heating element and an uncatalyzed diesel particulate filter with a back pressure monitor to achieve an 85 percent reduction in particulate matter emissions, qualifying it for Level 3 plus verification. Specific engine families and conditions for which the SEF Muffler System has been approved may be found in the Executive Order and attachment below.

Superseded Executive Orders