Rated IP66; Suitable for ISO 3-9 Cleanspaces; Suitable for 209E class 1-100,000 Cleanspaces; ETL listed for Wet Locations; One piece overlapping doorframe; Robotically seam welded housing; 0-10V 1 percent dimming comes standard (except 22 with HF LED Selection); Up to 35,000 Lm Delivered @127 Lm/W; DLC Standard and Premium Listings Available; B.A.A. Compliant & Made in the USA by a Family Owned US Corporation