Middle Atlantic MRK-4442PROLRD 44U 42-Inch Deep PRO Floor Rack
Overview
The Middle Atlantic MRK-4442PROLRD is a 44-rack-unit, 42-inch-deep open-frame floor rack engineered for demanding AV, security, and IT infrastructure deployments where load capacity, physical depth, and seismic compliance are non-negotiable. At 83.13 inches tall (211.2 cm) and 22 inches wide (55.9 cm), this rack accommodates full-depth servers, NVRs, UPS units, and professional AV gear while meeting TAA compliance requirements for government and federal procurement. Manufactured in the USA and listed to UL seismic load standards under ASCE 7-10, the MRK-4442PROLRD is a serious infrastructure frame — not a commodity rack.
Key Features
- 44 Rack Units of Usable Space: 77.13 inches (195.9 cm) of usable height across 44U means you can stack a full NVR stack, patch panels, power distribution, and ancillary AV equipment in a single frame without running out of real estate mid-deployment. That matters in server closets and equipment rooms where floorspace is allocated once and rarely revisited.
- 42-Inch Total Depth / 39.6-Inch Usable Depth: The 39.6-inch (100.6 cm) usable depth handles full-depth 1U and 2U servers, high-capacity NVR appliances, and rear-cabled UPS units without forcing cable management compromises. Shallow racks force front-to-back routing workarounds that create airflow and maintenance headaches — this frame eliminates that constraint entirely.
- 2,500 lb UL-Listed Load Capacity: The UL-rated 2,500 lb (1,134 kg) load rating means you can populate every shelf with dense, heavy hardware and trust the frame's structural integrity is verified — not just a marketing claim. Dense surveillance deployments running 48+ hard drives, large UPS units, and blade-style servers regularly approach 800–1,000 lbs of populated weight; 2,500 lb headroom keeps you well clear.
- 10,000 lb Weight Capacity: Separate from the UL load rating, the frame's total weight capacity is rated at 10,000 lbs (4,535.9 kg), giving structural engineers and facilities teams the hard number they need for floor-load calculations and seismic anchorage planning.
- Seismic Rating — ASCE 7-10 / UL Listed: The MRK-4442PROLRD carries UL listing specifically for seismic load capacity under ASCE 7-10, the standard referenced in most US building codes for seismic design. If your project is in California, Oregon, Nevada, Alaska, or any high-seismic zone, this listing is typically required for permit and inspection sign-off. Racks without it get flagged at inspection.
- TAA Compliant / USA-Made: Federal origin is listed as USA, and the rack is TAA compliant — a hard requirement for GSA schedule, DoD, and many state/local government contracts. If your customer's procurement team asks for TAA at project close, this unit qualifies.
- Cage Nut Rail System — 19-Inch EIA Panel Width: Standard cage nut rails accept the full range of rackmount hardware across AV, IT, and security categories. No proprietary mounting — any 19-inch rackmount panel installs without adapter hardware.
- Gangable Design: Multiple MRK-4442PROLRD frames can be ganged side-by-side for large equipment rooms or broadcast installations where a contiguous rack wall is needed. Useful in control rooms and NOC buildouts where the row needs to be aesthetically and structurally unified.
- Frame Only Configuration — No Rear Door, No Side Panels: Ships as a frame-only unit. No rear door and no side panels means full rear access and natural convection airflow — a practical advantage in high-density thermal environments. Add Middle Atlantic doors and panels as the deployment requires rather than paying for material you'll remove for service access anyway.
- 22-Inch Overall Width: The 22-inch (55.9 cm) exterior width fits standard 24-inch equipment room aisles and tile grids. If you're planning a raised-floor installation, verify tile cutout alignment before the frame arrives.
Integration & Compatibility
The MRK-4442PROLRD works with the standard Middle Atlantic Middle Atlantic rack accessories ecosystem — doors, side panels, casters, leveling feet, cable management trays, and power distribution units mount to this frame without modification. The 19-inch cage nut rail accepts any EIA-standard rack enclosure hardware from any manufacturer. For surveillance system integrators building out large NVR-and-storage infrastructure, pair this frame with a network video recorder stack and dedicated patch panel layer; the 39.6-inch usable depth and 44U height handle even the most storage-dense configurations. If your deployment involves seismic zone permitting, the ASCE 7-10 listing should be called out in the equipment schedule submitted to the AHJ. For integrators sourcing racks for government facilities, refer to your rack mounting accessories category for TAA-compliant anchorage and leveling hardware that matches this frame's compliance posture.
Frequently Asked Questions
Q: Is the MRK-4442PROLRD TAA compliant for federal government projects?
A: Yes. The MRK-4442PROLRD is TAA compliant with federal country of origin listed as USA, making it eligible for GSA schedule, DoD, and other government procurement vehicles that require TAA compliance.
Q: What is the UL-listed load capacity of the MRK-4442PROLRD?
A: The MRK-4442PROLRD carries a UL-listed load capacity of 2,500 lbs (1,134 kg). The total weight capacity rating is 10,000 lbs (4,535.9 kg). The UL listing is specific to seismic load capacity under ASCE 7-10.
Q: Does the MRK-4442PROLRD come with a rear door or side panels?
A: No. The MRK-4442PROLRD ships as a frame-only configuration — no rear door and no side panels are included. Middle Atlantic offers compatible doors and side panels as separate accessories for this frame.
Q: What rack unit and depth configuration does the MRK-4442PROLRD provide?
A: The MRK-4442PROLRD provides 44 rack units of space with 77.13 inches (195.9 cm) of usable height. Total rack depth is 42 inches (106.7 cm) with 39.6 inches (100.6 cm) of usable depth. Panel width is the standard 19 inches (48.3 cm) EIA with cage nut rails.
Q: Is the MRK-4442PROLRD suitable for seismic zones requiring ASCE 7-10 compliance?
A: Yes. The MRK-4442PROLRD is UL listed for seismic load capacity and references the ASCE 7-10 standard, which is the seismic design standard cited in most US building codes. This listing is typically required for installations in high-seismic zones such as California, Oregon, Nevada, and Alaska.
Q: Can multiple MRK-4442PROLRD units be ganged together?
A: Yes. The MRK-4442PROLRD is gangable, meaning multiple frames can be joined side-by-side to create a contiguous rack wall. This is commonly used in control rooms, NOC buildouts, and large equipment room installations.
The MRK-4442PROLRD (often searched as MRK 4442PROLRD) is the frame I spec when a project has three specific constraints stacked together: full-depth server hardware, a seismic zone AHJ, and a federal or state procurement requirement. The 39.6-inch usable depth handles equipment that shorter racks simply can't accommodate without cable dogleg gymnastics, and the UL seismic listing under ASCE 7-10 means your permit documentation has a real listing number to cite — not a vendor claim.
Technical Highlights:
- 2,500 lb UL Load / 10,000 lb Weight Capacity: The gap between these two numbers matters — the 2,500 lb figure is the UL-rated dynamic load (what you can actually populate and have inspected), while 10,000 lb is the static structural floor-load figure for facilities calculations. Both numbers are needed on a spec sheet for a permitting package; this frame provides both.
- 44U / 77.13-Inch Usable Height: At 44U you're fitting a complete surveillance back-end — NVR cluster, storage expansion, patch panels, and a full 2U UPS — without a second rack. That's a real wiring and maintenance simplification versus splitting across two 24U or 28U frames.
- Gangable, Frame-Only Design: Frame-only ships lighter (157 lbs) and installs faster. Doors and panels get added in the field based on what the room actually needs for airflow versus aesthetics. The gangable design means a row of three or four of these frames looks and mounts like a single integrated wall — important in finished control room environments.
Deployment Considerations:
- At 83.13 inches tall and 157 lbs shipping weight, confirm your freight elevator and doorframe clearances before delivery day — this frame will not fit through a standard 80-inch door opening without tilting, and standard 48-inch pallet jacks clear the 22-inch width but not always the door threshold lip on raised-floor rooms.
- The cage nut rails require cage nuts to be installed before mounting hardware — they are not pre-installed. Budget time in the equipment room for cage nut population before your rack population crew arrives, or pre-install panels in a staging area.
This frame is the right call for a government facility surveillance equipment room in a seismic zone — courthouse AV/security buildouts, state police dispatch centers, or federal campus NVR infrastructure where the permit package, TAA compliance cert, and UL seismic listing all need to land in the same submittal.
