Middle Atlantic L5-FLATFR-33LDW L5 Series Flat Frame Rack Enclosure, 12RU, 33 In Wide
The Middle Atlantic L5-FLATFR-33LDW is a 12RU open flat frame rack built for professional AV, security control rooms, and technical furniture installations where a full enclosed cabinet is unnecessary overhead. At 31.5 inches wide and a usable depth of 25.53 inches, it accommodates the dense equipment loadouts common in command centers and operations rooms without boxing in your thermal or cable management strategy. TAA-compliant and manufactured in the USA, the L5-FLATFR-33LDW fits procurement workflows that require domestic sourcing documentation.
Overview
The Middle Atlantic rack furniture L5 Series flat frame is designed for integrators who need structured equipment mounting without the cost or footprint of an enclosed rack. Open frame construction keeps airflow unrestricted and simplifies cable routing — both practical advantages when you're stacking NVRs, UPS units, patch panels, and control processors in a tight operations environment. The 12RU capacity targets mid-density builds where a full 42RU tower would be disproportionate. This unit ships domestically only and is not available for international orders.
Key Features
- 12RU Usable Capacity: 21 inches of usable height (53.3 cm) accommodates a mix of 1U and 2U devices — enough for an NVR, a managed PoE switch, a UPS, and patch panel in a single frame without crowding. If your equipment list runs deeper than 12RU, plan for a companion frame or a larger enclosure.
- 31.5-Inch Frame Width (1.5 Bay Configuration): The 33-inch nominal width translates to 31.5 inches of actual frame width (80 cm), fitting the L5 Series furniture ecosystem. This is a 1.5-bay configuration — sized between a single-bay and a dual-bay unit — which makes it useful when standard single-bay width is too narrow but a full double-bay is excessive for your rack density.
- 25.53-Inch Usable Depth: The 25.53-inch usable depth (64.9 cm) handles most 1U and 2U rack-mount gear without issue, including standard NVR chassis and enterprise switches. Full external depth is 28.31 inches — account for that in your furniture bay or room layout to avoid interference with rear walls or cable trays.
- 70 CFM Airflow Rating: The open flat frame design supports 70 CFM of passive or assisted airflow through the equipment bay. In a populated 12RU configuration with heat-generating video recording equipment, this is a meaningful advantage over enclosed cabinets that trap heat — but plan supplemental cooling if your ambient room temperature runs above standard data center norms.
- 10-32 Rack Rail Threading: Standard 10-32 threaded rails are universally compatible with rack-mount equipment across the rack accessories and AV/security ecosystem. No cage nuts required — directly thread your rack screws for faster installation and cleaner rail maintenance.
- Monitor Mounting Support: The L5-FLATFR-33LDW supports monitor mounting, making it suitable for operator workstation builds where a display needs to integrate directly with the rack furniture structure. Useful in control room layouts where screen positioning is part of the furniture design rather than a separate mounting solution.
- TAA Compliant, USA Origin: Both TAA compliance and Federal Ops Country of Origin listed as USA. This matters on government, DOD, and federally funded projects where Buy American Act and Trade Agreements Act documentation is part of the procurement checklist.
Integration and Compatibility
The L5-FLATFR-33LDW is part of Middle Atlantic's L5 lectern and technical furniture platform. It integrates with L5 Series worksurfaces, side panels, and enclosure accessories — meaning equipment-side infrastructure decisions (rail spacing, depth, cable routing) made at the frame level carry forward cleanly into the broader furniture build. The 10-32 rail standard ensures compatibility with virtually all rack-mount security and AV equipment. For larger deployments requiring more than 12RU in a single position, the L5 Series supports adjacent bay expansion. Pair this frame with a purpose-built rack power distribution unit to manage outlets and circuit protection within the usable depth envelope. The 25.53-inch usable depth accommodates standard-depth PDUs without forcing shallow compromises on equipment selection.
Frequently Asked Questions
Q: Is the L5-FLATFR-33LDW TAA compliant?
A: Yes. The L5-FLATFR-33LDW is TAA compliant with a Federal Ops Country of Origin of USA, making it suitable for government and federally funded procurement projects.
Q: What is the usable rack space in the L5-FLATFR-33LDW?
A: The L5-FLATFR-33LDW provides 12RU of rack space with 21 inches (53.3 cm) of usable height and 25.53 inches (64.9 cm) of usable depth.
Q: What rack rail thread standard does the L5-FLATFR-33LDW use?
A: The L5-FLATFR-33LDW uses 10-32 threaded rack rails, the standard threading used across the majority of rack-mount AV and security equipment.
Q: Can the L5-FLATFR-33LDW support a monitor?
A: Yes. Monitor mounting is supported, making this frame suitable for operator workstation and control room furniture builds where a display integrates directly with the rack structure.
Q: Is the L5-FLATFR-33LDW available for international shipping?
A: No. The L5-FLATFR-33LDW is not available for international orders. It is a domestic-only product.
Q: What is the shipping weight of the L5-FLATFR-33LDW?
A: The shipping weight is 127 lbs (57.6 kg). Factor this into freight planning, particularly for multi-unit orders or installations requiring elevator or lift access.
The L5-FLATFR-33LDW lands in a specific spot in the Middle Atlantic lineup — it's the right call when you need structured 12RU mounting within a furniture bay but don't want the thermal compromise or added cost of an enclosed cabinet. The 25.53-inch usable depth is the number I focus on first: it's generous enough to seat standard NVR chassis and managed switches without forcing you into shallow-mount variants, and the open frame keeps airflow from becoming a design problem before the first device is installed.
Technical Highlights:
- 70 CFM Open Airflow: Open frame construction allows 70 CFM of unrestricted airflow — meaningfully better than enclosed alternatives in warm control rooms where multiple 1U recorders and switches run continuously.
- 10-32 Threaded Rails: Universal 10-32 threading eliminates cage nut logistics on a 12RU build — faster rack-out, cleaner rail maintenance, and no mismatched hardware sourcing on a job site.
- TAA + USA Origin: Both federal compliance markers are verified for this SKU, which simplifies procurement documentation on government-funded security integrations without additional sourcing legwork.
Deployment Considerations:
- At 127 lbs shipping weight, freight planning matters — especially in multi-story installs. Confirm elevator clearance and floor load ratings before specifying multiple units in a single room.
- The 1.5-bay form factor is purpose-built for the L5 furniture platform. If your project uses a different Middle Atlantic furniture series or a third-party enclosure, verify bay width compatibility before ordering — the 31.5-inch frame width is not a universal fit.
This frame is a natural fit for security operations centers and AV control rooms where the furniture layout is pre-designed around the L5 platform and the integrator needs reliable TAA-compliant rack infrastructure that won't create thermal or cabling headaches in a 12RU mid-density build.
