California Air Resources Board

The purpose of this letter is to inform you of changes being made to EPA's naming conventions for engine family and test group names and evaporative and refueling family names and to introduce the naming conventions for the new permeation families which are now required for highway motorcycles and recreational vehicles.

First, we are updating the list of model year codes which is used in position 1 of all the family names to include codes for model years beyond 2009. Second, we are making changes to the list of industry sector codes which is in position 5 of all the family names. Third, we are providing the naming conventions for the new EPA Permeation Family names for highway motorcycles and recreational vehicles including nonroad motorcycles, all-terrain vehicles, and snowmobiles.

A complete description of all 12 characters of engine family/test group names, evaporative/refueling family names, and permeation family names for all industries is included with this letter for your reference.