Return tracks shall be 3" x 3" x 3/8" fiberglass angle supported by 1-1/2" thick UHMW-PE wall brackets spaced at maximum ten foot intervals. 3/8" fiberglass splice plates shall be supplied at each joint to facilitate alignment and attachment of the track angles. All return track hardware shall be stainless steel. Return rails shall be cut drilled and fitted in the field for installation. Support brackets shall be shipped to the field predrilled for installation.