The Metalux GR8 is a T8-dedicated lensed troffer designed to offer premium performance in a low profile housing. T8 dedication and optimized lamp to lens spacing provides the best in energy efficiency and optical control. The GR8"s shallow, low profile housing is compatible with even highly restrictive plenums. Luminaires are compatible with today"s popular ceiling systems. Certain airborne contaminants can diminish the integrity of acrylic components. Refer to the Material Compatibility tables for additional information. Reinforced flat white, steel door and reinforced mitered corners. Full-width mechanical light traps. Ample knockouts provided for continuous row wiring. Construction: Unitized low profile recessed housing is die formed of code gauge prime cold rolled steel with full length stiffeners and anybody endplate for added strength. Ballast cover is easily removed without tools. Die formed captive lamp holder bracket fully encloses lamp holder wiring for easy lamp holder replacement. Ample KOs are provided for continuous row wiring. Built-in grid-lock feature for safety and convenience. Electrical: Ballasts are CBM/ETL Class "P" and are positively secured by mounting bolts.