High bay fixtures are ideal for indoor applications whre ceiling mounting heights exceed 15 feet. Typical applications include warehouse facilities, assembly areas, gyms, hangers, transportation garages, loading and staging areas. Universal light-weight, easy to handle die-cast aluminum ballast housing finished in Duraplex II gray polyester powder Unique ballast housing design permits full flow-through ventilation for maximum cooling of all components Heavy-guage diffuse anodized aluminum reflector locks on adjustable straps for field adjustment of optics from wide to narrow distribution Rugged die-cast mounting plate tapped 3/4-14 NPS, accepts 3/4 pipe or 714S, 715NEW and 725S hooks Unit slips onto mounting plate leaving both hands free for wiring.