AH1100 Filter, Air Air filter used on the Elliott Power systems model 200RN Natural gas generatorAH1100 Air filter used with the Elliott natural gas generator. This air was one of 2 types used on the 200RN generator. the 2nd type was a cartridge type with a separate housing. This filter has it's own housing and you will replace the entire assembly, housing and filter. Cummins also used this filter on their NG fuel 855 engine. The Cummins model of engine was a GTA 855GE 2 natural gas fueled.