There's a proper way to "blow out" a paper element air filter. Once you're through working it over with the air hose, soak the paper thoroughly with three ounces of gasoline. Not two ounces, not four- - - -exactly three ounces. Carefully place the gasoline soaked filter on a patch of bare dirt, light a match, and toss it at the filter from a safe distance. Then go buy a new filter element. The compressed air blows holes in the filter media approximetly big enough to throw a a bowling ball through it. You might as well not run a filter at all, as try to clean one with compressed air!
Jerry.