The Middle Atlantic MRK-4436PROLRD is an MRK series 44 RU 36 inch deep rackwithout rear door. Specify MRK series when you need an enclosure built to perform like a workhorse. Its rugged, space-saving design and high seismic load rating make it a favorite of installing contractors, particularly on larger-scale multi-bay jobs. The MRK series also offers seismic certification and open or removable sides.