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1504.4.3 Sprinkler Head Protection
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Sprinkler heads installed in spraying spaces shall be protected in an approved manner from accumulation of residue from spraying operations. Sprinkler heads shall be inspected at least once per week and cleaned as needed. Bags used as a protective covering shall be of 0.003-inch-thick (0.076-mm-thick) polyethylene or cellophane or shall be of thin paper. Sprinkler heads contaminated by overspray particles shall be replaced with new sprinkler heads.