Intended for low to medium mounting heights and harsh environments where dust, dirt, humidity or moisture is present. Ideal for canopies, shipping docks, refrigerated areas and other non-hazardous environments. Certain airborne contaminants can diminish integrity of acrylic.Constructed from impact-resistant, UV-stabilized, reinforced polyester fiberglass housing. Shatter-resistant, high-impact 50% DR acrylic diffuser standard. Poured-in gasketing provides a continuous seal between housing and diffuser. Captive, corrosion-resistant, cam-action latches secure the diffuser.