§ 473-a. Posting of means of egress in places of public assembly. There shall be posted in a conspicuous place and manner at all exits in every place of public assembly, a printed scale floor plan of that particular floor or story, which shall show all means of egress, clearly labeling those exits to be used in case of fire. Said printed scale floor plan shall be no smaller than eight inches by ten inches and shall be posted in such a manner that it cannot be readily removed.