A-AP models are designed to have a compact solution for parts in tumbling movement (small batches or low production rate). The chamber integrate the rotating basket that has an octagonal shape. The basket is allocate inside a frame that permit an easy removal outside the cabin. A serie of nozzles can be integrated to obtain the desired cycle time. Both pressure and Venturi technologies can be applied. In case of longer cycle times, a double pressure vessel can be installed. The electrical cabin is equipped with two timers (one for blasting, one for blowing-off) while a frequency converter regulate the rotating speed of the basket.