Stack boards at up to 20 layers per minute with our 4700B High Speed Bottom-Up Stacker! The bottom-up feed design is lower to the ground than an over the top stacker for easier access to the stick placer and the infeed. The 4700B can handle material from 24 inches to 72 inches long, 1 1/2 inches to 5 1/2 inches wide, and 3/8 inches to 2 inches thick. The stacker can be used with or without an optional pit.