- This 12′ long tumbler is not only effective in separating debris from firewood, but is also versatile in being able to separate “wheat from the chaff.” The first 6 feet of the tumbler are designed to remove fine debris (like saw dust, wood chips and dirt), while the next 6 feet are designed to remove slivers and small pieces of split wood that can be marketed as kindling. The setup is easily connected in hydraulic series with an existing offloading conveyor system, and ready for your waste receptacles.