Durable, flange mounted fluorescent troffer. 20GA zinc coated steel housing for unmatched corrosion protection. Stainless steel options available. .150 extruded acrylic asymmetric/symmetric lens, with RFI shielding. Complies with applicable government RFI specs MIL-STD-461A, MIL-STD-462, MIL-STD-463. Guardcraft® antimicrobial coating available. Premium programmed rapid start ballasts are standard.