The series L1B and L1D ladders as manufactured by Halliday Products Inc. of Orlando, Florida, shall be constructed entirely of aluminum. The rails shall be 1/2” x 2 3/4” (13mm x 70mm) aluminum extrusion and shall be spaced 16" (406mm) apart. The wall mounted standoffs shall be 3/8” x 2 1/2” (10mm x 64mm) flat bar and welded to the rails at a maximum of 60" (1.5m) on center. The standoffs shall be a minimum of 7" (178mm) and manufactured to fit flush with the wall. 1 3/8" (35mm) diameter type "D" rungs with flat slip resistant surface shall be spaced at 12" (305mm) on center and welded to the outside of each rail.
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