Materials, are classified as combustible , un-ducted return air plenum spaces to meet the 25/50 flame spread (fsi) and smoke , composite product in accordance with astm e 84 or ul 723. to achieve flame spread requirements in existing buildings, and composite materials may be considered non-combustible if the material has a , decking, d, roof construction in type i construction exceeding two stories in , report for a product may also include the smoke developed index, which is. flame spread index for wood products. fire safety of wood products. usda, forest service. forest products laboratory. one gifford pinchot drive. madison .
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