Kerosene shop heaters.. Not really a tool but close enough.. Especially the ones with the blower. I bought one from harbor freight, fired it up and heard this noise like putting a pencil in a fan while its spinning.. Took it apart and found that the fuel line from the tank to the spray nozzle was hitting the fan blades. I think there was only about 1/64'' left in the wall of the rubber hose. That would have really sucked
