NFPA 1 Fire Code

20.1.2.3 Scenery and stage properties not separated from the audience by proscenium opening protection shall be of noncombustible materials, limited-combustible materials, or fire-retardant- treated wood. [101: 12.4.6.11.3; 101: 13.4.56.11.3] 20.1.2.4 In theaters, motion picture theaters, and television stage settings, with or without horizontal projections, and in simulated caves and caverns ... ................
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