Vertiv CMR-45U16-B-1224 45U Open-Frame Rack Enclosure
The Vertiv CMR-45U16-B-1224 is a 45U rack enclosure built for structured cabling, network equipment, and security infrastructure deployments where mounting flexibility and rail compatibility matter. Configured here in Black with a 16.25-inch depth profile, it targets wiring closets and smaller equipment rooms where space is constrained but a full 45U of vertical real estate is still required. For buyers searching this unit, it is also listed as CMR 45U16 B 1224.
Overview
The CMR series from Vertiv covers a range of rack configurations across multiple height and depth combinations — 45U, 52U, and 59U heights pair with depth options of 6", 10.5", 12", and 16.25". The CMR-45U16-B-1224 occupies the 45U/16.25" slot in that matrix, which makes it the right choice when you need a full-height server or network rack but cannot accommodate a deeper footprint. The 16.25" depth suits patch panels, cable management, and lighter active equipment — it is not sized for deep 1U servers or high-density UPS units without careful planning.
Key Features
- 45U Usable Height: Provides 45 rack units of vertical mounting space — enough to house a complete IDF stack (patch panels, switches, fiber terminations, cable managers) in a single enclosure without vertical overflow.
- #12-24 Tapped Rails: Factory-tapped #12-24 threaded holes mean standard cage nuts are not required for lighter equipment. Speeds installation when populating the rack with patch panels and cable management accessories. Confirm your specific equipment's mounting hardware before ordering if cage-nut compatibility is a requirement.
- 3/8" Sq. (M6) Mounting Option: Square-hole M6 rail compatibility ensures the CMR-45U16-B-1224 accepts the industry-standard cage nut most enterprise switching and server vendors ship with their equipment — no adapter plates needed for mainstream network switches and NVRs.
- 16.25" Depth: A shallower-than-standard footprint (most full enclosures run 24"–36" deep) makes this rack a practical fit for wall-adjacent installations, narrow wiring closets, and cabling-heavy buildouts where front-access depth is the binding constraint.
- Black Finish: The Black color variant (as opposed to Winter White) blends with standard data center and security equipment room aesthetics — no mismatch against dark-finished switches, NVRs, or cable management panels.
- Multiple Configuration Options: The CMR line is available in 45U, 52U, and 59U heights with depth choices of 6", 10.5", 12", and 16.25", giving integrators a consistent product family to standardize across sites with varying room dimensions.
Integration and Compatibility
The #12-24 tapped and 3/8" square M6 rail options cover the two most common mounting standards in commercial networking and security equipment. Most enterprise-class PoE switches, patch panels, fiber enclosures, and mid-depth NVRs will mount without issue. Verify equipment depth against the 16.25" internal clearance before specifying high-density or deep-chassis equipment. For installations where additional depth is needed, the CMR series offers 24" and deeper alternatives within the same product family — consult the Vertiv rack and enclosure catalog for the appropriate depth variant.
Frequently Asked Questions
Q: What mounting rail standards does the CMR-45U16-B-1224 support?
A: The CMR-45U16-B-1224 supports both #12-24 tapped rails and 3/8" square hole (M6) rails, covering the two most common mounting standards for commercial networking and security equipment.
Q: Is the 16.25" depth sufficient for standard 1U network switches?
A: Most 1U access-layer and distribution switches from major vendors ship at 12"–17" depth and will fit within the 16.25" internal clearance. However, deep-chassis core switches or high-density servers may exceed this depth — always verify the equipment's chassis depth before specifying this unit.
Q: What other heights are available in the CMR series?
A: The CMR series is available in 45U, 52U, and 59U heights with depth options of 6", 10.5", 12", and 16.25" — allowing integrators to match the enclosure to the room dimensions and equipment inventory of each site.
Q: What is the color of the CMR-45U16-B-1224?
A: The CMR-45U16-B-1224 is finished in Black. A Winter White variant is also available within the CMR line for environments where lighter finishes are preferred.
Q: Can cage nuts be used with the #12-24 tapped rails?
A: The #12-24 tapped rails do not require cage nuts — equipment mounts directly using #12-24 screws. If your equipment ships with cage nuts for square-hole rails, select the M6 square-hole rail configuration instead.
The CMR-45U16-B-1224 is a rack I reach for on wiring-closet and IDF builds where depth is the binding constraint. The 16.25" depth is specifically what sets this unit apart from a standard 24"-deep enclosure — in a narrow telecom room or wall-adjacent installation, that 8" difference is often the difference between a compliant install and a code-clearance problem.
Technical Highlights:
- Dual Rail Standard (#12-24 and M6): Having both tapped and square-hole options in the same CMR family means you can match the rail type to the dominant equipment brand on a given job, rather than retrofitting with adapter plates after the fact.
- 45U Vertical Capacity: A full 45U in a 16.25"-deep footprint is the practical ceiling for a shallow rack — you get full IDF density (24-port patch panel, managed switch, fiber shelf, horizontal managers) without needing to go to a deeper, heavier enclosure.
- CMR Family Depth Matrix (6"/10.5"/12"/16.25"): The ability to standardize on one product family across sites with different room depths simplifies procurement and spare-parts inventory — a single Vertiv CMR PO can cover four different room configurations.
Deployment Considerations:
- The 16.25" internal depth is the hard constraint — confirm chassis depth for every active device before finalizing the BOM. Managed switches from some vendors ship at 15"–17" and may be a tight fit or require the equipment to protrude at the rear.
- The spec data lists multiple depth and color variants (6", 10.5", 12", 16.25" / Black, Winter White) — verify the MPN suffix carefully at order time. CMR-45U16-B-1224 specifically calls out 16.25" depth and Black finish; selecting the wrong suffix will result in the wrong depth on delivery.
This unit is the right call for IDF closets, structured cabling rooms, and security equipment buildouts where a shallow footprint is required but a full 45U of vertical space cannot be sacrificed. It is not the pick for deep server chassis or high-density power distribution — for those, step up to a deeper CMR variant or a Vertiv VR enclosure.
