C & I Enclosures Type 4X Stainless Steel Floor Mounted Double Door Enclosures are UL Listed for either indoor or outdoor use to provide a degree of protection against falling rain, splashing water, and hose-directed water; undamaged by the formation of ice on the enclosure. Enclosure resists corrosion. Fabricated in accordance with U.L. specifications from code gauge type 304 stainless steel.