Arlington non-metallic enclosure boxes meet NEMA 3R requirements for outdoor use. They're the perfect solution for protecting and securing power backups, security devices and other valuable equipment indoors or outside. Made of heavy duty, UV rated non-metallic material and available in three sizes - our boxes are NEMA 3R rated for outdoor use when mounted with the hinge on top. Using a back plate allows an installer to mount components to the plate even after the enclosure box is mounted. Changing batteries and doing other maintenance work is easily accomplished by removing the plate. Arlington enclosure boxes are 'lockable' via a knockout on the front of the box for a cam lock - or a latch that holds a padlock.