A-02241329-AI Filter, Inner AirOne New Aftermarket Replacement Inner Air Filter for Deutz Fahr Tractors This secondary (inner) air filter element seats inside the outer primary air filter housing on Deutz and Deutz Fahr tractor engines. Acting as a safety filter, it provides an additional layer of engine protection by capturing fine particulates that pass through the outer element, helping to extend engine life and maintain peak performance. Compatible Models Deutz Fahr Tractors: