The access frame assembly consists of a circular cast collar measuring 17 inches in outer flange diameter and 11 3/4 inches in total height. The inner clear opening has a diameter of 13 1/2 inches at the top opening and 11 1/2 inches at the base flange. The top flange has a thickness of 1 1/4 inches with a 1 1/2 inch offset, while the wall thickness measures 5/8 inches. The bottom mounting flange extends to 17 inches with a thickness of 5/8 inches, and Section B-B indicates the profile cut along section lines B-B.
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