Middle Atlantic Rack - Steel - Black - Fully Welded Construction FOR Strength. Rack - ERK-4428

Middle Atlantic ERK-4428 44U Steel Floor-Standing AV Equipment Rack

The Middle Atlantic ERK-4428 is a 44-rack-unit, fully welded steel floor-standing rack engineered for high-density AV, security, and IT equipment installations where structural integrity and long-term load reliability are non-negotiable. At 28 inches deep with a UL-rated load capacity of 2,500 lbs and seismic certification, this is a rack built for permanent infrastructure — broadcast equipment rooms, security operations centers, data closets, and AV head-end racks that need to stay put and stay loaded. The ERK-4428 ships fully assembled (not flat-pack), which eliminates field assembly time and the risk of misaligned rails in a finished mechanical room.

Overview

The ERK series from Middle Atlantic represents the manufacturer's core fully welded open-frame rack line. The ERK-4428 occupies the high-density end of the series: 44U of usable panel space in a 28-inch-deep footprint, finished in black wrinkle powder coat, and manufactured in the USA. TAA compliance makes this rack procurement-ready for federal, state, and municipal contracts without additional sourcing documentation. For integrators working in equipment rack infrastructure, the ERK-4428 covers the full range from NVR/DVR stacks and video management servers to amplifiers, patch panels, and UPS units in a single enclosure.

Key Features

• 44U Rack Space (77.13 in usable height): 44 rack units gives you room for a fully populated security or AV head-end — NVRs, servers, switches, patch panels, KVM, and UPS — without stacking racks or splitting systems across multiple enclosures. The 77.13-inch usable height is the number that matters for planning, not the 81.13-inch overall height.
• 2,500 lb UL-Listed Load Capacity: UL listing on the load rating means the 2,500 lb figure is independently verified, not a self-reported spec. For a fully populated rack with high-density storage servers, multi-drive NVR arrays, or blade chassis, this rating provides substantial headroom — a typical fully loaded 44U security rack rarely exceeds 1,200–1,500 lbs.
• Seismic Rating (ASCE): The ERK-4428 carries a seismic load certification, which is a procurement requirement in California, the Pacific Northwest, and other seismic zones. This is also increasingly specified in data center and security operations center standards regardless of geography.
• 28-Inch Depth (26.47 in usable): The 28-inch external depth — 26.47 inches usable — accommodates most 1U and 2U rackmount equipment, including deep servers and NVRs, without front-to-back clearance issues. If you're installing unusually deep chassis (some storage arrays run 30+ inches), verify equipment depth against the 26.47-inch usable figure before specifying.
• Fully Welded Steel Construction: Welded construction versus bolt-together frames means no racking or flex under heavy dynamic loads — relevant in seismic events, during moves, or when the rack is fully populated. The steel material and black wrinkle powder coat finish hold up in mechanical rooms and equipment closets that see maintenance traffic.
• 10-32 Rack Rail Threading: Standard 10-32 tapped rails are compatible with the overwhelming majority of rackmount equipment, including all standard network switches, patch panels, NVR appliances, and AV gear. No cage nut inserts required — thread directly into the rail.
• Rear Door Included: The rear door ships with the rack, providing cable management discipline and basic physical access control at the rear of the enclosure. For high-security installations, a locking rear door variant should be confirmed at time of order.
• TAA Compliant, Made in USA: Manufactured domestically (Federal Ops Country of Origin: USA), the ERK-4428 satisfies Trade Agreements Act requirements — relevant for GSA schedule purchases, DHS, DoD, and state/local government procurements that mandate TAA-compliant infrastructure.
• Ships Assembled (Not Flat-Pack): The ERK-4428 does not ship flat — it arrives fully welded and assembled. This saves meaningful installation time on commercial jobs and ensures rail alignment is factory-set. Account for the assembled footprint when planning freight and doorway clearance (22 in wide × 28 in deep × 81.13 in tall, 168 lbs shipping weight).

Integration and Compatibility

The ERK-4428's 19-inch panel width and 10-32 rail threading are universal standards — every major NVR, server, switch, and AV processor in the market mounts directly without adapters. For network video recorders and security appliances, the 26.47-inch usable depth comfortably clears standard 1U–4U form factors. Middle Atlantic's own accessories ecosystem — PDUs, cable management panels, blanking panels, and shelf options — are designed to integrate directly with the ERK frame. For installations requiring power distribution within the rack, Middle Atlantic's rackmount PDU lineup pairs directly with this enclosure. When planning cable runs, the rear door clearance and side-panel access should be confirmed against your specific cable management accessories. The 136.1 lb rack weight plus equipment load should be factored into floor loading calculations for raised-floor or structurally sensitive installations — the 2,500 lb UL load capacity is a rack structural rating, not a floor loading endorsement.

Frequently Asked Questions

Q: Is the Middle Atlantic ERK-4428 TAA compliant?

A: Yes. The ERK-4428 is TAA compliant and manufactured in the USA (Federal Ops Country of Origin: USA), making it eligible for GSA schedule and other government procurements requiring Trade Agreements Act compliance.

Q: What is the load capacity of the ERK-4428?

A: The ERK-4428 has a UL-listed load capacity of 2,500 lbs (1,134 kg). This rating is independently verified by UL, not self-reported.

Q: Is the ERK-4428 seismic rated?

A: Yes. The ERK-4428 carries a seismic load capacity certification (ASCE/UL Listed: Seismic Load Capacity), making it suitable for installations in seismic zones and for projects requiring seismic-rated infrastructure.

Q: Does the ERK-4428 ship assembled or flat-pack?

A: It ships fully assembled — not flat-pack. The rack arrives as a welded, finished unit ready for equipment population. Shipping weight is 168 lbs; plan freight and doorway access accordingly given the 81.13-inch assembled height.

Q: What rail thread type does the ERK-4428 use?

A: The ERK-4428 uses standard 10-32 tapped rails, compatible with the vast majority of rackmount equipment. No cage nuts are required.

Q: What is the usable rack depth on the ERK-4428?

A: The usable depth is 26.47 inches (67.2 cm), within an overall rack depth of 28 inches. Most standard 1U–4U rackmount servers and NVRs fit comfortably; verify unusually deep chassis against the 26.47-inch figure.

Karl Wilson

The ERK-4428 (often searched as ERK 4428) is one of the few floor-standing racks I'd specify without hesitation for a permanent security operations center build-out — specifically because the 2,500 lb UL-listed load capacity is independently verified and the seismic certification is ASCE-recognized, not a marketing claim. On a recent SOC project, we populated 38 of the 44U with a mix of NVR appliances, managed switches, a KVM drawer, and redundant UPS units, and the welded frame didn't move or flex during installation or after full load. That's what welded construction buys you versus bolt-together.

Technical Highlights:

• UL-Listed 2,500 lb Load Capacity: Independent UL verification on the structural rating matters when you're specifying for high-density NVR stacks or blade chassis — it gives the structural engineer something to sign off on, and it gives you headroom most 44U racks never come close to using.
• 26.47-Inch Usable Depth: The 26.47-inch usable depth (versus the 28-inch external) is the number to hand your equipment procurement team. It clears virtually all standard 1U–4U rackmount security appliances and servers; the rare exception is ultra-deep storage arrays that push past 28 inches overall.
• Ships Assembled, 168 lbs: The assembled shipping weight of 168 lbs and the 81.13-inch height mean you need to plan building access before it arrives. A standard 36-inch commercial door clears the 22-inch width, but elevator cab depth and stairwell turns are the real constraints on multi-floor installs.

Deployment Considerations:

• The rear door is included, but if this rack is going into a secured equipment room with a physical access policy, verify whether a keyed or padlockable rear door variant is needed — the base ERK configuration should be confirmed with the distributor for locking options before the order is placed.
• The 136.1 lb empty rack weight plus a fully populated load approaching the 2,500 lb UL limit adds up fast. For raised-floor installations or older buildings, get a floor loading calculation done — the rack's structural rating does not substitute for a floor loading analysis.

For a government or municipal security operations center that needs TAA-compliant, seismic-rated, high-density rack infrastructure with full UL documentation for the facilities record, the ERK-4428 is the right specification. It's not the rack to over-specify for a small 8U closet install, but for 30U+ permanent deployments where the structural documentation matters, it delivers on every line item.