Middle Atlantic Essex Solid Door, 18 RUUpgrade your Essex MMR Series or QAR Series enclosure with the Middle Atlantic Essex Solid Door, 18 RU. This solid door is purpose built to fit both front and rear configurations, delivering robust protection for your gear while preserving the clean, professional look that your studio, broadcast facility, or data center demands. Designed for reliable, long term use in high traffic rack environments, this door helps guard against dust, accidental