Credit for Early VDECS (DPF) Retrofit_{Based on the Regulation as of September 7, 2012}

This credit applies to installation of vehicle diesel emission control systems (VDECS, AKA diesel particulate filter ? DPF) installed before the following dates.

• Large fleet: Before Jan 1, 2013
• Medium fleet: Before Jan 1, 2016
• Small fleet: Before Jan 1, 2018

VDECS reduce PM or PM and NOx. For PM VDECS it must be the highest efficiency available for an engine/application and have a minimum control efficiency of 50%.

The amount of credit is calculated as follows.

• For PM VDECS the credit is two times the hp of the engine retrofit.
• For VDECS that reduces PM and NOx, but where the VDECS is not the highest efficiency available for reducing PM the credit is the hp of the engine retrofit times two times the verified NOx control efficiency divided by 60.