In this Part -
"blasting" means the cleaning, smoothing, roughening or removing of part of any surface by the use as an abrasive of a jet of sand, metal shot, grit or other material, propelled by a blast of compressed air or steam or by a wheel;
"blasting enclosure" means - (a) a chamber, barrel, cabinet or other similar enclosure designed for blasting, or (b) any enclosure in which blasting is done;
"blasting chamber" means a blasting enclosure which a person can enter into;
"HEPA" means high efficiency particulate air.