Middle Atlantic ERK-4420 44U Server Rack Cabinet

Name: Middle Atlantic ERK-4420 44U Server Rack Cabinet
Brand: Middle Atlantic
SKU: ERK-4420

A fully welded, seismically certified 44U rack that holds 2500 lbs of mission-critical equipment with adjustable rails and a keylocked rear door.

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Overview

Reliable Equipment Housing with the Middle Atlantic ERK-4420 Rack

The Middle Atlantic ERK-4420 is a robust standalone rack designed to securely house your valuable equipment. With 44 rack spaces and a fully welded construction, this rack offers exceptional durability and stability. Its versatile design includes adjustable front rackrail, large cable entry, and a keylocked rear door for added security.

Specifications:

Rack Spaces: 44U
Construction: Fully Welded
Rackrail: 1 Pair Fully-Adjustable Front Rackrail
Cable Entry: Large Cable Entry in Bottom
Top: Configurable Open Top
Rear Door: Keylocked Solid Rear Door
Grounding: Grounding and Bonding Stud Installed in Base
Weight Capacity: 2500 Pounds
Mounting Type: 10-32 Threaded

Key Features

Fully welded construction, solid sides

UL Listed in the US and Canada

Seismic certified

1/2", 3/4", 1" and 1-1/2" electrical knockouts found on removable split rear plates, top knockout plate additionally includes UHF/VHF antenna knockouts

Frequently Asked Questions

What is the actual usable rack space in the ERK-4420?

The ERK-4420 provides 44U of rack space. Each rack unit equals 1.75 inches of vertical mounting height, giving you roughly 77 inches of total usable rail space — enough to house a full server stack alongside patch panels, KVM switches, and PDUs without running out of room.

Are the rack rails adjustable to accommodate different equipment depths?

Yes. The ERK-4420 ships with a single pair of fully adjustable front rackrails, which means you can position them fore-and-aft to accommodate shallow networking gear and deep 1U servers within the same enclosure. Rear-mounting support depends on your specific equipment and any optional rail kits.

What cable management options does the ERK-4420 provide?

The cabinet features a large cable entry in the bottom, and the removable split rear plates include 1/2", 3/4", 1", and 1-1/2" electrical knockouts. The top knockout plate adds UHF/VHF antenna knockouts — useful in AV and broadcast environments where RF cabling needs to exit the enclosure cleanly.

Is the ERK-4420 rated for environments where seismic activity is a concern?

Yes. The ERK-4420 carries seismic certification, which matters for facilities in earthquake-prone regions or for installations that must meet building code or insurance requirements. The fully welded construction — rather than bolted assembly — is what enables this rating and contributes to the overall rigidity.

How is the rear door secured, and does it allow ventilation?

The rear door is a solid, keylocked design — meaning physical security is built in without requiring an add-on lock. The trade-off is that a solid rear door provides no passive airflow path, so thermal planning (active cooling, blanking panels, airflow direction) is essential for dense deployments.

Strengths & Trade-offs

👍 Pros

Fully welded steel construction eliminates racking flex under the full 2500 lb rated load, giving high-density server deployments a stable, vibration-resistant foundation.
Seismic certification makes this rack compliant for data center and broadcast facility installations where structural codes require certified enclosures.
Removable split rear plates with multiple knockout sizes (1/2" through 1-1/2") allow clean, code-compliant cable routing without field cutting.
Keylocked solid rear door provides physical security for sensitive hardware without requiring a separate locking mechanism or accessory.
UL Listed in both the US and Canada, reducing procurement friction for enterprise and government installations that require listed equipment.

👎 Cons

Ships with only one pair of front rackrails — rear rail support for deep or heavy servers requires purchasing additional rail kits separately, adding cost and lead time.
Solid rear door eliminates passive rear exhaust airflow, requiring deliberate active cooling design; in high-density configurations this becomes a thermal management challenge.
The open top configuration is configurable but not sealed by default, meaning cable management above the enclosure requires a separately sourced top panel or brush strip.
At 44U, the cabinet's physical footprint and weight make repositioning after initial placement a two-person job — site planning must be finalized before installation.
No integrated cable management arm or vertical cable managers are included; power distribution and cable routing accessories are all additional purchases.