| UN R132 Retrofit Emissions | Retrofit Emission Control Devices | Uniform provisions concerning the approval of Retrofit Emission Control devices (REC) for heavy duty vehicles, agricultural and forestry tractors and non-road mobile machinery equipped with compression ignition engines WP.29 adopted the first phase text of the REC regulation at its November 2013 session. A second phase text is under consideration. Retrofit Emissions Retrofit Emission Control Devices UN Regulation No. 132 UN R132 | UNR | 132 |