... suitable for low to medium mounting heights where dust, dirt,humidity, or corrosive elements are present.Ideal for canopies, ... piece molded, impact resistant,UV stabilized, fiberglass reinforced polyester,with inverted “U” slot that allows diffuser to nesttightly. ... ,UV stabilized, clear polycarbonate. It is securedin place with eight polycarbonate cam latches.Optional stainless steel latches are also ...