Middle Atlantic 41SP/38D Multibay BGR RK - BGR-4138

Middle Atlantic BGR-4138 41U 38-Inch Deep Multibay AV Rack Frame

Overview

The Middle Atlantic BGR-4138 is a 41U, 38-inch deep steel rack frame engineered for demanding AV, security, and broadcast infrastructure installations where structural integrity and long-term adaptability are non-negotiable. At 75.88 inches tall with a 23-inch overall width and 19-inch panel width, this frame accommodates full-depth enterprise equipment — NVRs, servers, UPS units, and high-density patch fields — without the depth compromises that plague lighter commercial enclosures. Built in the USA and finished in a black wrinkle powder coat, the BGR-4138 ships as a frame-only configuration, giving integrators clean flexibility to specify doors, side panels, and accessories that match the actual deployment environment.

For security integrators spec'ing rack infrastructure alongside Middle Atlantic rack systems or network video recorders, the BGR-4138 belongs in any conversation about permanent, high-density equipment rooms where the enclosure needs to outlast multiple generations of installed gear.

Key Features

• 41 Rack Units / 71.88" Usable Height: Forty-one usable RU means you can fully populate a mix of 2U NVRs, 1U switches, patch panels, and UPS hardware in a single frame without running out of space mid-project. The 71.88-inch usable height leaves practical clearance for cable management accessories above and below the rail zone.
• 3,000 lb UL-Listed Load Capacity: The UL-listed 3,000 lb static load rating is not a marketing estimate — it's a tested figure that matters when you're stacking high-density storage servers or multi-drive NVR arrays. Dense video surveillance deployments with 24-bay NVRs and enterprise switches can approach 600–800 lbs of gear; at 3,000 lbs, this frame has headroom to grow.
• 38" Depth / 35.4" Usable Depth: Full-depth enterprise equipment (1U to 4U servers, high-capacity UPS units, deep-chassis NVRs) requires 30 inches of usable depth at minimum. At 35.4 inches usable, the BGR-4138 accommodates virtually every commercial rack-mount device in the market without forcing front-of-rack cable compromises.
• Seismic Rated — OSHPD OPM-0444-13 / HCAI: The frame carries seismic certification through California's HCAI (formerly OSHPD) program with a verified seismic load capacity of 1,175 lbs. This is a hard requirement for healthcare facilities, government buildings, and any California project subject to seismic bracing compliance. The OSHPD number OPM-0444-13 is on record — inspectors can verify it directly.
• TAA Compliant / USA Manufactured: Federal, state, and DoD projects under FAR/DFARS procurement rules require TAA-compliant equipment. The BGR-4138 ships from domestic manufacturing, satisfying Buy American and TAA requirements without requiring waivers or sourcing exceptions.
• Forward Rackrail + Gangable Design: The forward rackrail configuration keeps equipment weight closer to the frame's center of gravity — important for tall, loaded racks. The gangable design allows side-by-side frame installation in multi-bay rows, which is standard practice in larger equipment rooms and NOC environments where aisle management and cable routing need to be coordinated across frames.
• 25mm × 150mm Swing Handles: The integrated swing handles are sized for practical two-person maneuvering during installation. At 170 lbs shipping weight, this frame requires proper lift technique; the handle geometry gives installers secure grip points without improvising.
• Steel Construction / Black Wrinkle Powder Coat: Cold-rolled steel construction with powder coat finish resists corrosion and surface wear in equipment room environments. Unlike aluminum alternatives, steel provides better rigidity under concentrated point loads — relevant when mounting heavy UPS units or dense storage arrays on a single rail section.
• Rear Door Included: The rear door is part of the frame specification, providing physical access control to rear-facing equipment connections without requiring a separate door kit purchase. This matters for cable-heavy NVR and patch environments where rear access is frequent during commissioning.
• Forward Compatible Design: Middle Atlantic's forward-compatible engineering means accessory upgrades — side panels, additional doors, blanking panels, power distribution — integrate without frame replacement. For installations that phase equipment in over time, this prevents the frame from becoming obsolete when the rack population changes.

Integration & Compatibility

The BGR-4138 accepts standard 19-inch EIA rack-mount equipment across all 41U positions. The forward rackrail design is compatible with Middle Atlantic's accessory ecosystem including rack accessories such as power distribution units, cable management panels, and side panels. The gangable frame geometry supports multi-bay row configurations common in larger security operations centers and data closets. For integrators planning structured cabling alongside rack deployment, review a rack planning guide to coordinate cable pathways before frame placement — cable management is significantly easier before equipment population begins.

The frame-only configuration ships without side panels, top or bottom panels beyond the rear door. Specify Middle Atlantic accessory SKUs separately based on the required enclosure level for the installation environment. For projects requiring a fully enclosed cabinet rather than an open frame, evaluate the appropriate rack enclosures from the same family before committing to the BGR-4138 frame-only configuration.

Frequently Asked Questions

Q: Is the BGR-4138 seismically rated, and what certification does it carry?

A: Yes. The BGR-4138 holds HCAI (formerly OSHPD) seismic certification under OPM-0444-13, with a verified seismic load capacity of 1,175 lbs. This certification is a documented record — required for healthcare, government, and California-regulated facility projects.

Q: Is the BGR-4138 TAA compliant?

A: Yes. The BGR-4138 is TAA compliant and manufactured in the USA, satisfying federal and DoD procurement requirements under FAR/DFARS guidelines without waivers.

Q: What is the UL-listed load capacity of the BGR-4138?

A: The UL-listed static load capacity is 3,000 lbs (1,360.8 kg). This is a tested and listed figure, not an estimated rating.

Q: Does the BGR-4138 ship with side panels and a top cap, or is it a true open frame?

A: The BGR-4138 ships as a frame-only configuration with a rear door. Side panels, top panels, and additional accessories are specified and ordered separately from the Middle Atlantic accessory line.

Q: Can multiple BGR-4138 frames be installed side by side in a row?

A: Yes. The BGR-4138 is gangable, meaning frames are designed to install side by side in multi-bay rows. This is standard practice in NOC environments and large equipment rooms where coordinated cable management across adjacent frames is required.

Q: What is the usable rack depth for equipment installed in the BGR-4138?

A: Usable depth is 35.4 inches (89.9 cm). The overall frame depth is 38 inches; the difference accounts for the rackrail assembly and rear door structure. Most enterprise rack-mount equipment fits within the 35.4-inch usable envelope.

Marty Allison

The BGR-4138 earns its place in permanent security infrastructure installations because of two numbers that matter when the project is done and the room is locked: 3,000 lbs UL-listed load capacity and OSHPD seismic certification OPM-0444-13. Those aren't catalog claims — they're tested, listed, and verifiable. When I'm spec'ing rack infrastructure for a surveillance operations center or a healthcare facility, the BGR-4138 is the frame I reach for when the equipment list is heavy and the building code is strict.

Technical Highlights:

• Seismic Rating (1,175 lb / HCAI OPM-0444-13): California healthcare, municipal, and government projects require documented seismic compliance, not just a manufacturer claim. The OSHPD number is on record — building inspectors and AHJs accept it without additional engineering documentation in most cases.
• 3,000 lb UL Load / 41U Height: A fully populated 41U frame with enterprise NVRs, managed switches, UPS hardware, and patch panels can run 700–900 lbs of gear. At 3,000 lbs UL-listed, this frame handles even aggressive equipment density without approaching its structural limit.
• 35.4" Usable Depth: This is the spec that separates the BGR-4138 from shorter-depth alternatives. Full-chassis 2U and 4U NVRs with rear-access drive bays need real usable depth. At 35.4 inches, you're not forcing front-of-rack cable routing workarounds or cutting corners on equipment selection.

Deployment Considerations:

• The frame-only configuration is the correct choice when the deployment environment, cooling strategy, or physical security requirements call for custom door and panel specifications — order side panels and any additional enclosure components separately and verify SKU compatibility with Middle Atlantic's accessory line before the install date.
• At 170 lbs shipping weight, plan for a two-person lift and verify floor load ratings in the equipment room before placement — a fully loaded BGR-4138 at 3,000 lbs approaches the limits of standard commercial raised-floor tiles.

For a permanent security operations center, healthcare facility equipment room, or municipal NOC where TAA compliance and seismic certification are hard requirements, the BGR-4138 is the frame to spec. It's not the right answer for a temporary deployment or a low-density closet installation where a lighter, shallower frame would serve just as well at lower cost.