Middle Atlantic MRK-4431-AV 44U Gangable Pro AV Floor-Standing Rack
Overview
The Middle Atlantic MRK-4431-AV is a 44RU, 31-inch deep floor-standing rack from the Middle Atlantic MRK Series, pre-configured for Pro AV deployments where deep equipment, structured cable management, and seismic compliance matter. At 83.13 inches tall with 77.13 inches of usable height, it accommodates fully populated AV-over-IP, matrix switching, and DSP stacks in a single enclosure. The 29-inch usable depth handles large-frame equipment — signal processors, power conditioners, and high-density patch fields — without forcing compromises on cable dressing behind active gear. Built in the USA, this unit fits controlled equipment rooms, broadcast infrastructure, and permanent AV installs requiring a commercial-grade rack enclosure with documented seismic ratings.
Compatibility
The MRK-4431-AV uses standard 10-32 threaded rail on a 19-inch panel width, which accommodates the full range of EIA-310-compliant 1U–12U Pro AV equipment: Middle Atlantic's own power sequencers (e.g., RLNK series), fan trays, blanking panels, and cable management accessories integrate directly. The 23.25-inch external width is engineered for Middle Atlantic's gangable bay configurations — multiple MRK enclosures can be mechanically joined side-by-side for large multi-rack deployments. Compatible with standard rack accessories including rear-mount cable arms, PDU trays, and horizontal lacing bars sized for 19-inch bays. The included rear door and side panels suit closed-bay installs where airflow control and physical security are both requirements.
Installation Notes
Rated for seismic compliance per ASCE 7-10 with a UL-listed seismic load capacity of 1,050 lbs (476.3 kg) — relevant for installations in California, Pacific Northwest, and any jurisdiction enforcing IBC seismic provisions. The UL static load rating is 2,500 lbs (1,134 kg); the non-UL weight capacity listed is 10,000 lbs — specify the 2,500 lb UL figure for permit documentation. Airflow is rated at 550 CFM, which supports moderate-density thermal loads but should be evaluated against your equipment's BTU output before skipping supplemental fan trays. Shipping weight is 268 lbs — plan for liftgate delivery and two-person positioning. Note that per product configuration, the Gangable field in source data reads 'No' — confirm side-gang compatibility with Middle Atlantic directly before spec'ing a multi-bay install. See the rack planning guide for bay layout and load distribution guidance.
