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Materials used for interior trim shall be not less resistant to flame spread than the class of materials specified in this section for the following rooms or spaces:
(a) Required stairway enclosures and enclosed connections from such stairways to outside exits, Class 1;
(b) Assembly rooms or spaces having a capacity exceeding 1,000 persons, Class 1;
(c) Materials used for interior trim in all other rooms and spaces shall be not less resistant to flame spread than Class 3 materials.
(Prior code § 62-9.6)