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Sec. 494(35). Smoke pipes.

(a) No smoke pipe shall be within six (6) inches of any woodwork,
or any wooden lath and plaster partition or ceiling.

(b) Where smoke pipes pass through a wooden lath and plaster
partition, they shall be guarded by galvanized iron ventilated
thimbles at least twelve (12) inches larger in diameter than the
pipes, or by galvanized iron thimbles built in at least eight (8)
inches of brick work or other incombustible material.

No smoke pipe shall pass through any floor or a roof having
wooden framework except as specified in section 494(33).