have effective barrier materials on the skin and must be lined with absorptive supplies on the within. Because noise will escape via the opening, the noise path should be treated with sound-absorbing supplies if potential. Also, the number of openings ought to be restricted and must be directed away from workers, if attainable. Figure 40 reveals a partial enclosure that allows entry while affording the operator some protection from the noise supply. Despite the challenges related to enclosures, they are often the most effective approach to management noise hazards.