18.104.22.168. walls in Exits
(1) Except as provided in Sentence (2), at least 90% of the exposed surfaces of every wall in an exit shall have a surface flame-spread rating of not more than 25.
(2) At least 75% of the wall surface of a lobby used as an exitin Article 22.214.171.124. shall have a surface flame-spread rating of not more than 25.
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