Middle Atlantic MRK Series 37U 22"W Rack, 31" Deep (No Rear Door)

Discover the MRK Series by Middle Atlantic—a rugged, space-saving enclosure engineered to perform like a workhorse on demanding, multi-bay installations. With a high seismic load rating and versatile access options, this 37RU, 22-inch-wide rack is built for installers who demand reliability, ease of service, and scalable integration in broadcast, IT, and AV environments. The MRK line is celebrated for its seismic certification, durable construction, and flexible door configurations, including open or removable rear doors to simplify maintenance and maximize airflow.

• Rugged, space-saving design for demanding installations — The MRK Series is purpose-built to maximize rack density without compromising sturdiness. Its compact footprint supports multi-bay configurations on large projects, while the robust enclosure stands up to the rigors of on-site installation, transport, and daily use. This model’s 37 rack units (RU) provide ample space for servers, audio-visual gear, network switches, and patch panels, all in a chassis that minimizes footprint in control rooms, equipment rooms, or rig floors. The space-efficient profile also aids in cable management by allowing cleaner, more organized runs between devices, reducing interference and improving air flow. This means you can consolidate more gear into fewer enclosures, streamlining setup, maintenance, and future upgrades.
• Seismic-certified performance for critical environments — For installations where vibration and seismic activity are considerations, MRK enclosures deliver peace of mind. The MRK Series is designed and certified to meet seismic loading requirements, helping protect sensitive electronics and ensure equipment remains properly mounted during acute events. This certification is particularly valuable in multi-bay data center suites, broadcast facilities, and commercial AV installations where building codes and safety standards demand rugged, vibration-resilient enclosures. By choosing MRK, you invest in long-term reliability, consistent performance under stress, and fewer service disruptions caused by movement or racking failures.
• Open or removable rear doors for accessibility and airflow — Flexibility matters in complex installations. This MRK model is designed to accommodate either an open rear or a removable rear door configuration, enabling rapid access to rear-mounted equipment and easier cable routing. The open-door option simplifies routine maintenance, card swaps, and mounting adjustments, while the removable door supports secure transport and controlled access in sensitive environments. Together with the rear-door options, you gain improved airflow management, cooling efficiency, and reduced downtime during installations and upgrades. This adaptability is especially beneficial in broadcast suites and IT rooms where frequent changes to rack contents are common.
• Comprehensive compatibility with accessories and cable management — Middle Atlantic’s MRK series is renowned for its compatibility with a broad range of accessories, including adjustable mounting rails, cable management arms, ducted or vented doors, fans, and seismic-brace options. The 37 RU, 22" wide footprint accommodates standard 19" equipment with ample clearance for cabling and FireWire/HDMI/ethernet runs. With thoughtful cable management, you can reduce cable clutter, improve airflow, and simplify equipment swaps. The enclosure’s interior geometry is designed to facilitate neat patching, quick swaps, and scalable growth, making it an ideal platform for trail-ready AV rigs, data centers, and multimedia studios.
• Ideal for large-scale multi-bay jobs and professional installation teams — Contractors and integrators rely on MRK enclosures for their reliability, seismic certification, and straightforward installation across multiple bays. The 37 RU capacity aligns with common server, switch, and equipment footprints, while the robust construction supports long-term use on job sites and in production facilities. This model’s balance of capacity, accessibility, and adaptability makes it a favorite for multi-room or multi-rack deployments where consistency, serviceability, and uptime are crucial. By standardizing on MRK, teams can expedite installations, simplify inventory management, and deliver uniform performance across all bays of a facility.

Technical Details of Middle Atlantic 37 RU MRK Series 22 Inch Wide Rack, 31 Inches Deep without Rear Door

• Rack Units (RU): 37 RU
• Exterior width: 22 inches
• Depth: 31 inches (without rear door)
• Seismic certification: Yes
• Rear door configuration: Open or removable rear door option

How to install Middle Atlantic MRK Series 37U Rack

• Plan your layout: Determine the bay arrangement and identify locations for power, cooling, and network connections. Ensure adequate clearance for front door access and rear cable management, taking into account future expansion within the 37 RU capacity.
• Prepare the mounting rails: Install adjustable 19-inch rack rails inside the MRK enclosure to accommodate a variety of equipment depths. Make sure rails are level and square to ensure proper mounting and airflow. Use the provided hardware and weight-rated fasteners suitable for your floor and mounting surface.
• Mount equipment: Begin with the heaviest components at the bottom for stability, then add mid-weight and lighter devices. Align gear with the rails and secure with screws or cage nuts as specified by the equipment manufacturer. Leave ample space between devices for ventilation and for easy cabling access.
• Route cables and manage airflow: Use the MRK’s cable management features, including ducts, grommets, and ties, to keep power and data cables organized and separate. This improves airflow, reduces heat buildup, and makes future swaps or expansions more straightforward. If using a rear door, plan for cable access through the door opening and ensure no obstructive cabling blocks the door path.
• Seal and verify operation: Close the door (open or removable, per configuration) and verify clearance around all equipment. Power up the system, perform a basic post-install check, and confirm that cooling airflow is unobstructed. Document the rack configuration for future maintenance and warranty records, and store spare mounting hardware and screws for quick replacements.

Frequently asked questions

• Is this MRK rack Seismic certified? Yes. The MRK Series is designed with seismic certification to support installations in environments where stability under vibration and movement is essential, making it a trusted choice for multi-bay deployments.
• What is the RU capacity and footprint? The model shown offers 37 RU of vertical mounting space and a 22-inch-wide footprint, with a depth of 31 inches when the rear door is not installed. This combination provides significant rack capacity within a compact footprint suitable for dense installations.
• Does it come with a rear door? This configuration is specified as without a rear door, but MRK enclosures are available with various rear-door options (open or removable) to suit your access and airflow needs. Check your exact SKU for the rear-door option.
• What equipment types fit in this rack? The MRK series supports standard 19-inch equipment such as servers, network switches, patch panels, audio-visual gear, and related accessories. With 37 RU, you have flexibility to arrange devices by weight, function, and cooling requirements while keeping cables organized.
• What installation scenarios is MRK best suited for? This enclosure excels in large-scale multi-bay installations, including data centers, broadcast facilities, control rooms, IT closets, and professional AV rooms. Its rugged build, seismic certification, and flexible door options make it a reliable backbone for complex, high-demand setups.