Abstract: A filter element includes a region of filter media and at least one end cap secured to the filter media. The end cap includes a protrusion that is shaped in order to mate with another filter element. The shaped end cap can act as a centering device. A filter assembly can be constructed including a first filter element and a second filter element. Each of the first and second filter elements has an end cap that includes a projection and recess arrangement. A seal is formed between the first filter element and the second filter element by compression of the two elements together with an engagement or inter-nesting of the projection and recess arrangement of the first filter element with the projection and recess arrangement of the second filter element. The filter element assembly is useable in a variety of systems including a gas turbine air intake system.