The principle of the suction type (sometimes called a gravity or siphon type) is the same as an air gun for injecting paint or a sprayer for ironing. The AM type and *Petit-blasting PM type belong in this category. The mechanism is very simple but the power is lower than that of a direct presure type. In many cases, general air blasting means this suction type.
The abrasive media control is relatively easy compared with other types, and this type may be applicable for precision products. In that case, the machine will be expensive because of the mechanisms included within the machine to enhance precision. During continuous injection, refilling abrasive media is easy.