R 325.50253 Definitions.

Rule 3. (1) "Abrasive" means a solid substance used in an abrasive-blasting operation. (2) "Abrasive-blasting respirator" means a respirator constructed so that it covers the wearer's head, neck, and shoulders to protect the wearer from rebounding abrasive. (3) "Blast-cleaning barrel" means a complete enclosure that rotates on an axis, or that has an internal moving tread to tumble the parts, in order to expose various surfaces of the parts to the action of an automatic blast spray. (4) "Blast-cleaning room" means a complete enclosure in which blasting operations are performed and where the operator works inside of the room to operate the blasting nozzle and direct the flow of the abrasive material. (5) "Blasting cabinet" means an enclosure where the operator stands outside and operates the blasting nozzle through an opening or openings in the enclosure. (6) "Clean air" means air that will not cause harm or discomfort to an individual if it is inhaled for extended periods of time. (7) "Dust collectors" means a device or combination of devices for separating dust from the air handled by an exhaust ventilation system. (8) "Exhaust ventilation system" means a system for removing contaminated air from a space that is comprised of 2 or more of the following elements: (a) An enclosure or hood. (b) Duct work. (c) Dust-collecting equipment. (d) Exhauster. (e) Discharge stack. (9) "Particulate-filter respirator" means an air-purifying respirator, commonly referred to as a dust or a fume respirator, that removes most of the dust or fume from the air passing through the device. (10) "Respirable dust" means airborne dust in sizes capable of passing throughout the upper respiratory system to reach the lower lung passages. (11) "Rotary blast-cleaning table" means an enclosure where the pieces to be cleaned are positioned on a rotating table and are passed automatically through a series of blast sprays. (12) "Abrasive blasting" means the forcible application of an abrasive to a surface by pneumatic pressure, hydraulic pressure, or centrifugal force.