Middle Atlantic WRK-40-27LRD 40RU Seismic-Rated Floor-Standing Rack Enclosure

The Middle Atlantic WRK-40-27LRD is a 40-rack-unit, open-frame floor-standing rack built for environments where structural integrity and long-term load reliability aren't optional — think broadcast rooms, security operations centers, data closets, and any facility in a seismic zone. At 27.63" total depth (25.75" usable) and a full 70" of usable vertical height, it gives integrators the real estate to fit high-density NVR stacks, UPS units, patch panels, and active network gear in a single column without compromise.

The WRK-40-27LRD ships from a US facility, is TAA-compliant for federal and government procurement, and carries UL certification for seismic load capacity under ASCE 7-10 — the structural engineering standard used in most US seismic design codes. That's a meaningful spec if you're installing in California, the Pacific Northwest, or any jurisdiction that requires documentation of equipment anchoring compliance.

Key Features

• 40 Rack Units / 70" Usable Height: Seventy inches of usable space means you can build out a full NVR-plus-networking stack — recorder, PoE switches, UPS, patch panels, KVM — without running into the ceiling of the cabinet. Most integrators find 32–36RU fills up fast once cable management and blanking panels go in; 40RU gives you breathing room.
• 10,000 lb Static Weight Capacity: This is a structural number, not marketing — the frame handles 10,000 lbs of static load. For reference, a full 40RU rack loaded with servers or NVRs rarely exceeds 1,500–2,000 lbs. The headroom here means you're not engineering around cabinet limits when specifying dense hardware.
• UL-Listed Seismic Rating (ASCE 7-10): The UL listing for seismic load capacity under ASCE 7-10 is verifiable documentation — not just a marketing claim. This matters on government projects, healthcare facilities, and any AHJ (Authority Having Jurisdiction) that requires third-party seismic certification for rack equipment. The 2,500 lb UL-rated dynamic load capacity is the figure to cite in submittal packages.
• TAA Compliant / Made in USA: Federal projects, GSA schedule buys, and DoD installations often require TAA-compliant equipment. The WRK-40-27LRD is manufactured in the USA and meets the Trade Agreements Act requirements — no import substitution risk on government bids.
• Gangable Design: Multiple WRK units can be bolted together side-by-side to form a multi-bay rack row without gaps or misalignment. For a security operations center or broadcast control room with 80–120RU of total gear, gangability eliminates the need for individual floor anchoring of each cabinet and produces a cleaner finished install.
• 10-32 Rack Rail Threading: Standard 10-32 threading is compatible with the overwhelming majority of 19" rackmount equipment — servers, NVRs, switches, UPS units, patch panels, KVM drawers. You won't need cage nuts or rail adapters for standard rackmount gear.
• 19" Panel Width / 24.25" Overall Width: Standard 19" EIA-310 panel width accommodates every mainstream rackmount product. The 24.25" overall footprint is the industry-standard rack width — fits standard raised-floor tiles and typical aisle layouts without custom planning.
• No Rear Door (LRD Configuration): The LRD designation indicates this unit ships without a rear door. That's the right call for high-airflow environments (open-frame ventilation) or where rear cable access needs to remain unobstructed. If your deployment requires a rear door for dust or physical security, plan for the appropriate Middle Atlantic accessory door.

Integration and Compatibility

The WRK-40-27LRD follows EIA-310 19" rack standards, making it compatible with virtually all commercial rackmount equipment: network video recorders, PoE network switches, UPS units, patch panels, KVM switches, and cable management arms. The 10-32 threaded rails accept standard rackmount screws directly. For multi-bay deployments, the gangable frame bolts to adjacent WRK units to form a continuous rack row — useful in security system head-end rooms where multiple NVR stacks, storage arrays, and network equipment share the same physical footprint.

Because this is an open-frame design with no rear door, integrators should pair it with appropriate rack accessories — blanking panels, cable management, and brush-pass grommets — to maintain airflow discipline in high-density builds. In seismic zones, anchor hardware selection should reference the ASCE 7-10 rating and local AHJ requirements for floor attachment.

For integrators sourcing a full rack solution from the Middle Atlantic product line, compatible accessories include side panels, doors, top panels, and seismic anchoring kits designed specifically for the WRK chassis.

Frequently Asked Questions

Q: Is the WRK-40-27LRD TAA compliant for government procurement?

A: Yes. The WRK-40-27LRD is TAA compliant and manufactured in the USA, making it eligible for federal, GSA schedule, and government bids that require Trade Agreements Act compliance.

Q: What is the seismic certification on the WRK-40-27LRD?

A: The WRK-40-27LRD is UL-listed for seismic load capacity and rated per ASCE 7-10. The UL-rated dynamic load capacity is 2,500 lbs (1,134 kg). This is third-party certified documentation suitable for AHJ submittal packages on seismic-zone installations.

Q: Does the WRK-40-27LRD include a rear door?

A: No. The LRD designation means this unit does not include a rear door. It ships as an open-frame configuration. Rear door accessories are available separately in the Middle Atlantic WRK accessory line if your installation requires one.

Q: Can multiple WRK-40-27LRD units be ganged together?

A: Yes. The WRK-40-27LRD is gangable — multiple units can be bolted side-by-side to form a continuous multi-bay rack row, which is common in security operations centers and broadcast control rooms with large equipment footprints.

Q: What rack rail thread type does the WRK-40-27LRD use?

A: The WRK-40-27LRD uses standard 10-32 threaded rack rails, compatible with the vast majority of 19" rackmount equipment without cage nuts or adapters.

Q: What is the maximum weight capacity of the WRK-40-27LRD?

A: The static weight capacity is 10,000 lbs (4,535.9 kg). The UL-certified seismic dynamic load capacity is 2,500 lbs (1,134 kg). For typical security and AV rack builds, the static capacity is effectively unlimited relative to realistic equipment loads.