Abstract: The present invention relates to an automatic height adjusting manifold, and in particular to a manifold that is adjustable to be located adjacent to a workpiece. A conveyor can have an overhead structure that supports a concealer such as a canopy or removable doors. A sizing device measures the height of a workpiece. The sizing device is outside of the work areas of the machine. A height safety is provided to make sure that no workpieces taller than the measured piece enter the machine. There are liquid bays and blowoff bays within the machine. The blowoff bay has an air knife or other manifold device. A height system is provided and is adjustable to correlate with the measured height at the sizing device. A string potentiometer can be used for an air knife position feedback to the programmable logic controller (PLC).