A combustion tool has a housing with an air intake end and an opposite
bumper end, a combustion-powered power source in the housing including a
cylinder encircling a reciprocating piston associated with a driver
blade, and having at least one air port located at the bumper end below
the piston. At least one air intake is located adjacent the air intake
end and is provided with an air filter. At least one air passageway is
provided in fluid communication with the at least one air port and in
operational relationship with the air filter.