It depends on the operating mechanism. Machines that project a high-velocity jet of water or steam for surface cleaning or blasting are generally captured here. However, units where the primary function is pumping rather than projecting — such as pressure washers driven by a pump assembly — may be classified under pump or cleaning-machine headings. The distinction often turns on whether the jet-projection function or the pump function is the essential character of the machine.

Yes — both portable handheld units and large industrial blast rooms or cabinets operate on the same abrasive-jet projection principle and are classified within this heading. Size and portability do not change the classification; what matters is the functional method (projecting abrasive media by compressed air or steam). Importers should ensure product descriptions clearly identify the blasting medium and operating mechanism to avoid confusion with spray-gun or agricultural-sprayer headings.