Middle Atlantic 44 Space 36IN. Deep MRK Series Cage Nut Without Rear Door - MRK-4436PROLRD

Middle Atlantic MRK-4436PROLRD 44U Open Frame Rack with Proliant Rail

Overview

The Middle Atlantic MRK-4436PROLRD is a 44-space, 36-inch deep open-frame floor-standing rack built for high-density AV, security, and IT equipment installations where load capacity and seismic compliance are non-negotiable. At 83.13 inches tall and 22 inches wide, this frame-only configuration ships without a rear door — intentional for environments that need unrestricted rear cable access or frequent rear-panel maintenance. The Proliant rail system and cage nut mounting interface make it a practical fit for data centers, server rooms, and enterprise security head-end equipment rooms where a mix of vendor hardware must co-exist on standard 19-inch rails. If you're evaluating Middle Atlantic racks for a structured cabling or AV-over-IP head end, the MRK-4436PROLRD belongs at the top of the shortlist.

Key Features

• 44 Rack Units of Usable Space: 77.13 inches of usable height across 44U means you can stack full-depth servers, NVR appliances, patch panels, and power distribution units in a single frame without running out of vertical real estate mid-project. That's meaningful on multi-camera network video recorder deployments where NVR, PoE switch, and UPS all need to live in the same enclosure.
• 2,500 lb UL-Listed Load Capacity: The 2,500 lb UL-rated vertical load is not a marketing figure — it's a tested, listed value. That covers even the heaviest populated rack scenarios: fully loaded 2U servers, dense patch fields, and multiple power strips without approaching the structural limit. The frame's static weight capacity extends to 10,000 lbs, which speaks to the steel gauge in the uprights.
• 36-Inch Depth (33.6 in Usable): At 36 inches nominal and 33.6 inches usable, this rack accommodates full-depth 1U and 2U servers, large UPS units, and rear-cable-management accessories without compromise. Shallow-depth equipment installs with room to route cables cleanly behind the mounting plane — no forced cable bends against rear panels.
• Cage Nut Rail Interface: Cage nut rails are the universal standard for commercial and enterprise equipment. Unlike fixed-thread rails, cage nut positions are field-adjustable and compatible with virtually every 19-inch rack-mount device on the market. On a 44U frame housing mixed security, networking, and compute hardware, that flexibility eliminates the compatibility headaches that come with proprietary rail systems.
• No Rear Door — Frame Only: The open rear design is a deliberate choice for cable-intensive installations. Integrators running structured Cat6A, fiber trunks, or heavy PDU cabling appreciate the unobstructed access. If a rear door is required later, Middle Atlantic's modular MRK ecosystem supports accessory add-ons. For now, the frame-only configuration keeps weight down (152 lbs shipping weight) and cost focused on what matters: the structural frame and rail system.
• Seismic Compliance — ASCE 7-10: UL-listed for seismic load capacity to ASCE 7-10, this rack is engineered for installations in seismic zones where equipment anchoring is code-required. That's a hard requirement in California, Pacific Northwest, and other Zone 3/4 markets — and increasingly specified by enterprise customers outside those zones as a risk-mitigation measure. Having ASCE 7-10 compliance built in means no retrofit anchoring kits or third-party certification delays on the project.
• TAA Compliant, USA Origin: Federal Ops Country of Origin is USA and the unit carries TAA compliance — both required for GSA schedule purchases and most federal/state/municipal government bids. If the deployment is a government facility, security operations center, or federally funded project, this rack clears the procurement gate without a waiver.
• Gangable Configuration: The MRK-4436PROLRD is gangable, meaning multiple frames can be mechanically joined side-by-side into a continuous row. For large head-end rooms or data halls where rack density is expanding, gangable frames let you grow the installation without starting over on the physical infrastructure.

Integration & Compatibility

The 19-inch panel width and cage nut rail system accept standard EIA-310-compliant rack-mount equipment from any vendor — NVRs, PoE switches, access control panels, patch panels, UPS units, and KVM switches all mount without adapter plates. The Proliant rail system is purpose-designed for server-class equipment with sliding rail kits, making this frame a natural fit for hybrid security-and-IT head ends where Dell, HP, or Lenovo servers share rack space with surveillance infrastructure. For structured deployments, pair this frame with a rack cable management solution before populating equipment — the open rear makes cable routing straightforward but planning the run paths before install saves significant rework. The frame-only product configuration (MRK-4436PROLRD, often searched as MRK 4436PROLRD) means no pre-installed door or side panels — confirm your accessory order if the installation requires an enclosed appearance.

Frequently Asked Questions

Q: Is the MRK-4436PROLRD TAA compliant?

A: Yes. The MRK-4436PROLRD is TAA compliant and manufactured in the USA (Federal Ops Country of Origin: USA), making it eligible for GSA schedule purchases and government procurement contracts.

Q: What is the load capacity of the MRK-4436PROLRD?

A: The MRK-4436PROLRD carries a UL-listed load capacity of 2,500 lbs (1,134 kg) and a static weight capacity of 10,000 lbs (4,535.9 kg). The 2,500 lb figure is the tested, listed vertical load rating.

Q: Does the MRK-4436PROLRD come with a rear door?

A: No. This is a frame-only configuration without a rear door or side panels. The open rear is intentional for cable-intensive installations requiring unrestricted rear access.

Q: Is the MRK-4436PROLRD seismic rated?

A: Yes. It is UL listed for seismic load capacity and complies with ASCE 7-10, the standard referenced for seismic design loads in commercial construction. This satisfies code requirements in seismic zones and is increasingly specified for non-seismic sites as a risk-mitigation measure.

Q: What rail type does the MRK-4436PROLRD use?

A: The MRK-4436PROLRD uses cage nut rails — the universal EIA-310 standard compatible with virtually all 19-inch rack-mount equipment from any manufacturer.

Q: Can multiple MRK-4436PROLRD frames be joined together?

A: Yes. The MRK-4436PROLRD is gangable, allowing multiple frames to be mechanically joined side-by-side for larger row configurations.

James Everett

The MRK-4436PROLRD is the frame I specify when the deployment brief calls for ASCE 7-10 seismic compliance and there's no appetite for retrofitting anchoring hardware after install. At 44U and 33.6 inches of usable depth, it handles the full stack — NVR, core switch, UPS, patch panel — without forcing compromises on equipment selection based on depth limitations.

Technical Highlights:

• 2,500 lb UL Load Rating: This is a listed, tested value — not a calculated estimate. On a fully populated 44U frame with dual-PSU servers and a bottom-mounted UPS, you're realistically pushing 800–1,200 lbs of equipment. The 2,500 lb ceiling gives you meaningful headroom without engineering analysis.
• 10,000 lb Static Weight Capacity: The upright steel gauge supports 10,000 lbs static — four times the UL dynamic rating. Relevant when the frame is anchored to a concrete slab and the structural engineer needs to sign off on point loads.
• ASCE 7-10 Seismic Compliance: UL listed to ASCE 7-10 seismic load capacity. On California, Oregon, or Washington state projects — or any federally funded facility with seismic provisions in the spec — this rating satisfies the AHJ without a separate engineering study on the rack itself.

Deployment Considerations:

• The frame-only configuration ships at 152 lbs. Budget for two-person installation and confirm the floor loading calculation with the structural team before positioning — the combined frame-plus-equipment weight on a single footprint can challenge older raised-floor tiles.
• No side panels are included. If the installation is in a customer-facing space or requires airflow management between adjacent frames, order side panels separately before the install date — sourcing them after the frame is populated is a significantly harder job.

This rack earns its place in government security operations centers, enterprise server rooms in seismic zones, and any head-end room where the project spec explicitly calls out TAA compliance, UL load ratings, and ASCE 7-10 seismic certification. If the project doesn't have those requirements, a shallower or lower-U frame may be more cost-effective — but when the spec calls for all three, the MRK-4436PROLRD checks every box from a single line item.