Air filter assembly for combustion tool

A combustion tool comprising:

• a tool housing enclosing a combustion power source and having an upper housing end;
• a filter housing disposed upon said upper housing end, said filter housing defining a filter chamber and having a closed end and an opposite open end;
• at least one air stack at least partially located within said filter housing and having a base and a conduit, said conduit having a base end and an inlet end, in fluid communication with said chamber, said base end of said conduit is in fluid communication with said power source;
• at least one filter element having opposing ends and being located in said filter housing between said base and said inlet end, said housing having at least one air intake slit positioned adjacent to said at least one filter element and configured such that air entering said slit is forced to pass through said at least one filter element before entering said inlet end;
• said at least one filter element being a foam material saturated with oil, and having pores with a pore size greater than a target particle size, said pores each having a length and arranged in a misaligned configuration along said length to force directional changes in airflow and increase contact with said at least one filter element;
• and
• at least one standoff wall enclosed by said tool housing and extending from a point adjacent to one of said ends of said filter element and said closed end of said housing, said at least one standoff wall defining a space extending from said at least one filter element to said inlet end for air to flow through said at least one filter element, contact an inner surface of said closed end, and change direction to flow through said inlet end and into said conduit.