Ceilings and interior walls shall be free from all projections that might cause injury to pupils, and shall require the use of an inner lining of suitable flame retardant material. Exposed edges shall be hemmed, beaded, or flanged.

Source. #4873, eff 07-24-90; ss by #6297, eff 7-23-96; ss by #8122, INTERIM, eff 7-17-04, EXPIRES: 1-13-05; ss and moved by #8248, eff 1-4-05 (from Saf-C 1311.11); ss by #10439, eff 10-11-13 (see Revision Note #1 at chapter heading for Saf-C 1300); ss by #14005, eff 6-22-24, EXPIRES: 6-22-34 (see Revision Note #2 at chapter heading for Saf-C 1300)