Vertiv CMRX-45U16-B-SQM6 45U Open-Frame Rack — 16.25" Depth, Black, M6 Mounting

Overview

The Vertiv CMRX-45U16-B-SQM6 is a 45U open-frame rack built for data center and network infrastructure deployments where airflow, accessibility, and cable management take priority over full enclosure. The 16.25" depth keeps the footprint compact — useful in equipment rooms and colocation cages where floor space is constrained. At 45U of usable vertical space, it accommodates a full complement of 1U and 2U servers, switches, patch panels, and ancillary gear without requiring a deep cabinet footprint.

The CMRX series from Vertiv open-frame racks is designed for environments that prioritize technician access and cooling efficiency. Open-frame construction means front, rear, and side access without removing doors or side panels — a meaningful time saver during provisioning or troubleshooting in colocation and enterprise server rack deployments.

Key Features

• 45U Vertical Capacity: Forty-five rack units of mounting space handles a full stack of 1U servers, patch panels, and networking gear. If your build is equipment-dense and you are close to 45U today, consider the 52U or 59U variants in the CMRX family before committing — adding vertical space at rack-build time is far cheaper than a forklift swap later.
• 16.25" Depth: The shallow 16.25" depth (versus the 24", 30", or 36" options in the CMRX family) is the right call for network-heavy builds where switches and patch panels dominate and deep server mounting is not required. Shorter depth also simplifies cable routing between adjacent racks in tight rows.
• Black Finish: The black powder-coat finish is standard for data center infrastructure and colocation environments where equipment aesthetics are consistent across vendors. The CMRX family also offers Winter White if your facility standard differs.
• 3/8" Square Hole (M6) Mounting: The SQM6 designation means this rack ships with 3/8" square holes threaded for M6 cage nuts — the most common standard in enterprise and colocation environments. M6 hardware is universally stocked, which avoids the compatibility friction that can arise with #12-24 tapped or unthreaded variants when provisioning mixed-vendor equipment. Confirm your equipment rail kit specifies M6 square-hole compatibility before ordering — most enterprise server and storage vendors ship M6 kits as default, but budget-tier networking gear sometimes assumes #12-24.

Integration and Compatibility

The CMRX-45U16-B-SQM6 is compatible with standard 19-inch rack-mount equipment. The M6 square-hole pattern is supported by virtually all enterprise server, storage, and networking vendors including major OEMs. When pairing with PoE switches or network equipment in a security or surveillance head-end build, the open-frame design simplifies cable runs for both structured cabling and power distribution. Pair with a dedicated rack-mount power distribution unit (PDU) for clean power delivery across all mounted equipment.

If your deployment requires a fully enclosed cabinet — for physical security of the equipment, dust control, or noise attenuation — the CMRX open-frame format is not the correct choice. Consider a closed cabinet variant in the Vertiv line instead.

Frequently Asked Questions

Q: What mounting hole standard does the CMRX-45U16-B-SQM6 use?

A: The SQM6 suffix indicates 3/8" square holes configured for M6 cage nuts — the enterprise standard. This is compatible with the vast majority of rack-mount server, storage, and networking equipment from major OEMs.

Q: Is the CMRX-45U16-B-SQM6 an open-frame rack or a fully enclosed cabinet?

A: It is an open-frame rack. There are no doors, side panels, or roof panels. This maximizes airflow and technician access but provides no physical enclosure for the equipment mounted inside.

Q: What is the usable rack height of the CMRX-45U16-B-SQM6?

A: 45U of usable vertical mounting space. The CMRX family also offers 52U and 59U configurations if your build requires more vertical capacity.

Q: Can I order this rack in a different depth or color?

A: The CMRX family supports multiple depth options (10.5", 16.25", 24", 30", 36") and two colors (Black, Winter White). The CMRX-45U16-B-SQM6 specifically is the 45U, 16.25" depth, black, M6 square-hole configuration. Other combinations use different model numbers.

Q: Does the CMRX-45U16-B-SQM6 support both #12-24 and M6 mounting?

A: No — this specific SKU (SQM6) ships with the M6 square-hole pattern only. The CMRX family offers #12-24 tapped and unthreaded (clear) variants under separate model numbers. Verify your equipment's rail kit requirements before ordering.

Ted Perry

The CMRX-45U16-B-SQM6 is a straightforward open-frame rack call for environments where the 16.25" shallow depth is the deciding factor. I see this configuration most often in network head-end rooms and colocation cages where the build is dominated by switches and patch panels — gear that rarely exceeds 14" in chassis depth — rather than deep 2U servers that need a 24" or 30" rail span.

Technical Highlights:

• M6 Square-Hole Pattern: The SQM6 designation eliminates the cage-nut compatibility guesswork that comes with #12-24 tapped racks. Enterprise server and storage vendors default to M6 rail kits — you will not be hunting for adapters at installation time.
• 16.25" Depth at 45U: This is the sweet spot for a pure networking rack. Forty-five units of vertical space with a shallow footprint means you can fit a full access-layer stack — core switch, distribution switches, patch panels, fiber panels — without a deep cabinet eating into aisle clearance.
• Open-Frame Construction: No doors or side panels means unrestricted front-to-back airflow, which matters when you are running high-density switching gear that generates significant heat. It also means every port on every piece of gear is reachable without opening anything.

Deployment Considerations:

• The 16.25" depth limits you to equipment with short chassis depth. Before mounting servers, measure the rail-to-rail span your server's slide kit requires — most 1U/2U servers need 26" to 36" of depth. This rack is not the right pick for compute-heavy builds.
• Open-frame means zero physical security for the mounted equipment. If the rack sits in a shared colocation space or an unsecured IDF closet, plan for a separate locking cage or cabinet instead.

The CMRX-45U16-B-SQM6 is a solid fit for a dedicated network-layer rack in a structured colocation row or a purpose-built security head-end room — anywhere you need maximum port accessibility, clean cable runs, and M6 compatibility without the bulk of a full enclosure.