Section 219-29-06 - Seats and Seating PlatformsA. Seats and Seating Platforms: The horizontal distance back-to-back of bleacher seat platforms used without individual chairs shall not be less than twenty-two (22") inches. Where the same level is used for seats with backs these levels shall not be less than twenty-four (24") inches in width. Where chairs are used, the horizontal distance back-to-back shall be thirty (30") inches.B. Seats shall be securely fastened to their supports in such a manner that they cannot accidentally be displaced. Foot rests shall be supported in such a manner that they cannot accidentally be displaced. Foot rests which are lapped shall be provided with some positive means to prevent displacement of one piece on the other. All chairs shall be securely fastened in place.C. Where seats are not provided or marked off, a width of eighteen (18") inches shall be considered one seat.16- 219 C.M.R. ch. 29, § 06