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NOTE – if recess is poured during construction it is recommended to fill the recess with plywood covering it with another plywood piece well overlapping the frame to protect the recess and the frame from accidental damage. Before installing the panel recess must be clean to ensure even surface for the panel to rest on. Panel Construction: RGA-200 constructed from T shaped treads assembled onto 5/16 inch steel rods. Rods are spaced out every 12 inches. High density polyethylene spacers placed between treads. On the bottom of the panel spacers extend past the treads so the panel would rest on spacers ensuring quiet operation.