Middle Atlantic MRK-4426LRD 44U Gangable Open-Frame Floor Rack
Overview
The Middle Atlantic MRK-4426LRD is a 44-space (77.13 in usable height), 26-inch deep open-frame floor rack built for AV and security equipment rooms where rear-access cabling and side-to-side rack expansion matter more than door security. At 22 inches wide with a 19-inch panel width and 10-32 threaded rails, the MRK-4426LRD accepts any standard rack-mount gear — NVRs, network switches, patch panels, power distribution units — without adapter hardware. The frame-only configuration ships without side panels or a rear door, keeping cabling access open on three sides, which suits integrators routing dense conduit or cable management horizontally between adjacent racks. TAA-compliant and manufactured in the USA, this rack is procurement-eligible for federal, state, and education projects where country-of-origin documentation is required.
Compatibility
Accepts all standard 19-inch rack-mount equipment on 10-32 threaded rails: network video recorders, PoE network switches, patch panels, PDUs, and cable management panels. The gangable frame design means multiple MRK-series units can be bolted side-by-side — useful for large-format control rooms or equipment closets requiring more than 44U of vertical space in a continuous row. The 24-inch usable depth (26-inch external) accommodates most 1U–4U rack-mount appliances without rear-door clearance conflicts; verify equipment depth against the 24-inch usable dimension before deploying deep 2-post-style servers. Compatible with Middle Atlantic rack accessories including side panels, casters, and seismic anchor kits. Pairs naturally with Middle Atlantic power distribution and cable management accessories designed for the MRK family.
Installation Notes
Seismic rating per ASCE 7-10 — the rack qualifies for installations in seismic zones when anchored to a concrete floor using manufacturer-specified anchor hardware (not included). UL-listed load capacity is 2,500 lbs; the structural weight capacity reaches 10,000 lbs, but the UL-certified figure governs equipment loading for code-compliance documentation. At 146 lbs shipping weight, two-person handling is required during positioning. Ships as drop-ship only — plan receiving logistics for a large freight item rather than a parcel delivery. No rear door is included in this configuration; if rear door security is required, specify the MRK-4426LRD-appropriate door accessory separately or evaluate an alternate MRK configuration with an integrated rear door.
