A 1-1/4 inch by 1-1/4 inch by 1/4 inch steel angle frame surrounds the drainage grate, supported by a continuous 16-gauge steel skirt. The frame includes a 1/4 inch thick steel angle slotted 7/16 inch by 3/4 inch for concrete anchor bolts spaced 24 inches on center. Concrete anchor bolts are installed on site to secure the frame assembly into the surrounding concrete substrate. The assembly accommodates standard 3-1/4 inch height configurations suitable for typical 60 millimeter pavers set on a 3/4 inch to 1 inch sand bed. Other custom heights can be specified to accommodate alternative paver and bedding situations.
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