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All interior wall and ceiling finish and trim shall be classified in accordance with resistance to spread of flame. Rate of spread of flame shall be determined by the tunnel-type test methods established in the following documents:
(a) Bulletin of Research No. 32, Fire Hazard Classification of Building Materials. ULI, September, 1944;
(b) Tentative Outline for Fire Hazard Classification of Building Materials. ULI, July, 1947.
(Prior code § 65-8.1)