The SRW12USNEMA protects sensitive equipment against dirt, dust, lint, oil, drips and splashes. Its built-in air filter, louvered vents on the front door and side panels, sealed gasket around the door frames and brush strips around cable access points prevent dripping water, oil and airborne contaminants from getting inside. You can replace the air filter with standard, off-the-shelf furnace filters. Four high-performance intake fans built into the front door pull filtered air through the cabinet to keep your equipment cool. The cabinet swings away from the wall on a sturdy hinge, allowing easy back-door access to equipment and cabling during installation and maintenance. The reversible doors can open left or right. The doors and side panels lock securely to help prevent damage, tampering or theft. Convenient ports on the back door allow easy cable routing. The SRW12USNEMA comes fully assembled and ready to mount to the wall.