Middle Atlantic 2 BAY Seismic RIB MRK 42D 24H - SRB-2-MRK-4224

Middle Atlantic SRB-2-MRK-4224 2-Bay Seismic Riser Base for MRK/VRK Rack Systems

The Middle Atlantic SRB-2-MRK-4224 is a two-bay seismic riser base engineered for MRK and VRK series rack enclosures in facilities where seismic compliance is a hard requirement — hospitals, data centers, broadcast installations, and government facilities operating under ASCE 7-10 seismic standards. At 42 inches deep and 24 inches tall, it raises rack systems to an ergonomic working height while providing a rated 1,750 lb seismic load capacity and OSHPD certification (No. 96-01027) for California healthcare deployments. If your project drawings call out seismic anchorage for AV or IT infrastructure, the SRB-2-MRK-4224 is the component that satisfies the structural engineer's requirement.

Key Features

• 1,750 lb Seismic Load Capacity: Rated to hold 1,750 lbs (793.8 kg) under seismic loading conditions — not just static weight. That means a fully populated dual-bay rack with UPS, NVRs, and dense switching gear stays anchored through a seismic event rather than tipping or shifting, which is the failure mode that causes secondary damage in server rooms.
• ASCE 7-10 Compliance: Designed and tested to meet ASCE 7-10 seismic standards — the structural engineering reference most AHJs and building departments require on commercial and institutional projects. Specifying this base lets you hand the structural engineer a document reference rather than a field conversation.
• OSHPD Certification (No. 96-01027): California's Office of Statewide Health Planning and Development (OSHPD) certification is a non-negotiable for equipment installed in licensed California healthcare facilities. The SRB-2-MRK-4224 carries this certification, which eliminates the certification review cycle that adds weeks to hospital and clinic projects.
• Two-Bay Configuration, 44.03" Wide: The dual-bay footprint (44.03 in / 111.8 cm wide) accommodates side-by-side MRK or VRK enclosures as a unified structural base. Two racks share one anchored riser rather than requiring two separate bases — cleaner installation, fewer anchor points to coordinate with the floor.
• 42" Depth Matches Deep Rack Systems: The 42-inch (106.7 cm) depth aligns with full-depth rack enclosures carrying network switching, UPS, and server hardware. A shallow riser base under a deep rack creates an overhang that undermines seismic stability; this base is sized to match the load it carries.
• 24" Riser Height for Ergonomic Access: The 24-inch (61 cm) elevation positions the bottom of the rack at a standing-accessible height, which matters during initial installation and in ongoing maintenance scenarios. It also provides underfloor cable management space in raised-floor environments without requiring a separate cable management riser.
• Textured Black Powder Coat Finish: The textured black powder coat is durable under the mechanical stress of rack loading and unloading cycles and matches the standard Middle Atlantic MRK/VRK aesthetic — relevant when the installation is in a visible equipment room or broadcast environment where finish consistency matters.
• Compatible with MRK and VRK Series: Designed specifically for Middle Atlantic MRK and VRK rack families, so the mounting geometry, bolt patterns, and structural interface are engineered fits — not field adaptations. Confirm your rack series matches before ordering; this base is not a universal fit.

Integration and Compatibility

The SRB-2-MRK-4224 is a structural base component, not a rack enclosure. It pairs directly with Middle Atlantic MRK and VRK series enclosures as a seismically rated foundation. It is not compatible with other rack families. In California healthcare and state-regulated facilities, the OSHPD certification (No. 96-01027) allows this base to pass plan check without additional structural testing — coordinate with your GC and structural engineer early to confirm the seismic zone classification and confirm ASCE 7-10 applicability for your jurisdiction. For rack enclosure planning in security operations centers or large NVR deployments, pairing seismic-rated bases with properly specified PoE network switches and NVR appliances ensures the full stack meets both structural and operational requirements. Consult a rack accessories specialist if you need coordinated cable management or power distribution for the riser space below the enclosures.

Frequently Asked Questions

Q: What rack series is the SRB-2-MRK-4224 compatible with?

A: The SRB-2-MRK-4224 is designed specifically for Middle Atlantic MRK and VRK series rack enclosures. It is not a universal seismic base and should not be paired with other rack families without confirming structural compatibility with Middle Atlantic directly.

Q: Does the SRB-2-MRK-4224 meet California hospital seismic requirements?

A: Yes. The SRB-2-MRK-4224 carries OSHPD certification number 96-01027, which is required for equipment installations in California OSHPD-regulated healthcare facilities. This satisfies plan check requirements without additional structural testing for covered rack installations.

Q: What is the maximum load capacity of the SRB-2-MRK-4224?

A: The seismic load capacity is rated at 1,750 lbs (793.8 kg). This is the rated capacity under seismic loading conditions per ASCE 7-10, not just a static weight limit.

Q: How many rack enclosures does the SRB-2-MRK-4224 support?

A: It is a 2-bay base, designed to support two side-by-side MRK or VRK series enclosures as a unified seismically rated structure. The overall width is 44.03 inches (111.8 cm).

Q: What seismic standard does the SRB-2-MRK-4224 comply with?

A: The SRB-2-MRK-4224 is rated to ASCE 7-10, the standard most commonly referenced by structural engineers and building departments for seismic anchorage of non-structural components in commercial and institutional construction.

Q: Does the riser base include floor anchoring hardware?

A: Floor anchoring hardware is not confirmed in the available product documentation. Coordinate with your structural engineer and Middle Atlantic for the appropriate anchor kit for your floor type and seismic zone classification.

James Everett

The SRB-2-MRK-4224 is one of those components that looks like a line-item afterthought on a BOM until the structural engineer's review comes back — at which point it becomes the critical path item. The 1,750 lb seismic load rating combined with OSHPD certification No. 96-01027 means this base satisfies both the IBC structural requirement and California's healthcare-specific approval process in a single component. I've seen hospital AV and security infrastructure projects stall for weeks waiting on seismic documentation for rack bases; specifying the SRB-2-MRK-4224 from the start eliminates that delay.

Technical Highlights:

• 1,750 lb Seismic Load Capacity: This is a seismic load rating — not just a static shelf rating. At 793.8 kg, it comfortably handles a fully populated dual-bay MRK system carrying UPS, NVR appliances, and switching gear through a seismic event without shifting or tipping.
• 24" Riser Height: The 24-inch elevation isn't arbitrary — it positions the rack bottom at standing-accessible height and creates meaningful underfloor cable routing space in raised-floor data rooms, eliminating the need for a separate cable riser accessory in many installs.
• ASCE 7-10 Compliance: ASCE 7-10 is the reference standard most structural engineers and AHJs call out by name on commercial drawings. Having the certification documented means no field engineering, no custom calculations, and no back-and-forth with the structural engineer of record.

Deployment Considerations:

• The SRB-2-MRK-4224 is MRK/VRK-specific — confirm your rack series before ordering. It will not fit other Middle Atlantic lines or third-party enclosures without voiding the seismic rating.
• Floor anchoring hardware is not confirmed as included in this SKU. Coordinate the anchor kit selection with your structural engineer based on concrete slab type and seismic zone classification before scheduling installation day.

For California OSHPD-regulated hospital security operations centers or emergency dispatch infrastructure requiring both ASCE 7-10 seismic compliance and a dual-rack footprint, the SRB-2-MRK-4224 is the correct structural foundation — specify it early and get the certification documentation into your submittal package before the structural review milestone.