The small ones have a foam element between two screens and will keep out small rocks but seems prone to getting holes in the foam if you get a back fire through the air valves. The big filters are more of a paper type element and probably do a better job of cleaning the air.
but seems prone to getting holes in the foam if you get a back fire through the air valves. The big filters are more of a paper type element and probably do a better job of cleaning the air.
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