Middle Atlantic CI Recessed FLR BX - RFB4-CI-1

Middle Atlantic RFB4-CI-1 CI Recessed Four-Gang Cast Iron Floor Box

Overview

The Middle Atlantic RFB4-CI-1 is a four-gang recessed floor box designed for concrete slab installations where you need a durable, low-profile AV and data connection point at floor level. At 11.63 in wide × 14.25 in deep × 3.5 in tall (29.5 × 36.2 × 8.9 cm), it drops into a standard concrete cutout and sits flush with the finished floor — the right choice for boardrooms, training centers, open-plan offices, and conference facilities where exposed cable runs are not an option.

The RFB4-CI-1 (often searched as RFB4 CI 1) is part of Middle Atlantic's Resource RFB Series, a line built around the premise that infrastructure devices belong in the floor, not the wall, when the room layout demands flexible seating or central presenter positions. Cast-iron construction gives it the mass and rigidity to handle foot traffic and rolling loads without deforming the box or misaligning the covers above it.

For integrators speccing Middle Atlantic floor and rack infrastructure, this model fills the four-gang concrete-pour application — verify your slab depth accommodates the 3.5 in height before roughing in. For broader connectivity planning across a facility, pair it with your AV infrastructure category selections for a cohesive floor-level distribution layout.

Key Features

• Four-Gang Capacity: Four device openings in a single box means you can land power, data, HDMI, and USB in one flush location — eliminating the need for multiple single-gang cuts that create alignment headaches and weaken the slab pour around them.
• Cast-Iron Body: The CI designation means cast-iron construction throughout, not sheet steel. Cast iron distributes point loads across the entire box footprint rather than concentrating stress at corners — important in high-traffic areas where a chair caster or rolling cart would dent a lighter enclosure over time.
• Concrete-Pour Application: This box is designed to be set in place before the concrete is poured, becoming a permanent part of the slab. That means no anchoring hardware to source separately and no risk of the box shifting under load after installation.
• Compact 3.5 in Depth: The 3.5 in (8.9 cm) height fits into standard slab depths without requiring a structural engineer's sign-off for a deeper pocket cut — relevant in renovation projects where the existing slab thickness is fixed.
• 11.63 in × 14.25 in Footprint: The 11.63 × 14.25 in (29.5 × 36.2 cm) plan dimension accommodates standard four-gang cover plates from the RFB Series without custom fabrication.
• Low-Profile Recessed Design: Sitting flush with the finished floor surface, the RFB4-CI-1 eliminates trip hazards and keeps the room aesthetic clean — a requirement in client-facing spaces where exposed floor hardware is a liability concern.

Integration and Compatibility

The RFB4-CI-1 is intended for use with compatible Middle Atlantic RFB Series cover plates and inserts. Confirm cover plate compatibility with the four-gang CI box variant before ordering inserts — the RFB Series spans multiple box depths and gang counts, and not every insert kit is rated for the cast-iron body. For facility-wide floor box planning, cross-reference slab depth specs and cover finish requirements early in the design phase to avoid field modifications. TAA compliance is not applicable to this SKU, so confirm procurement policy requirements with your purchasing team if federal contracting rules apply. Integrators handling multi-room deployments should also review cable management solutions to coordinate below-slab conduit routing with the box position before the pour.

Frequently Asked Questions

Q: What are the dimensions of the RFB4-CI-1?

A: The RFB4-CI-1 measures 11.63 in wide × 14.25 in deep × 3.5 in tall (29.5 × 36.2 × 8.9 cm).

Q: Is the RFB4-CI-1 TAA compliant?

A: No. The RFB4-CI-1 is not TAA compliant per the manufacturer's specification. Verify procurement requirements before ordering for federal projects.

Q: What type of floor installation is the RFB4-CI-1 designed for?

A: The RFB4-CI-1 is designed specifically for concrete floor installations. It is set in place prior to the concrete pour, becoming a permanent fixture in the slab.

Q: How many device positions does the RFB4-CI-1 provide?

A: Four gang positions, allowing you to populate the box with a combination of power, data, AV, or USB inserts depending on the cover plate and insert kit selected.

Q: What cover plates are compatible with the RFB4-CI-1?

A: The RFB4-CI-1 is part of Middle Atlantic's Resource RFB Series. Compatible cover plates and inserts should be confirmed against the four-gang cast-iron variant in the RFB Series documentation — not all RFB covers are interchangeable across box depths and materials.

Ted Perry

The RFB4-CI-1 is one of those products that only becomes a problem when it's specified too late — once the slab is poured around the wrong box, you're coring concrete to fix it. The 3.5 in depth is the number I always confirm first against the structural drawings: in a standard 4 in concrete pour over metal deck, you have maybe a quarter inch of margin, and this box fills it correctly without requiring a depressed slab pocket.

Technical Highlights:

• 3.5 in Height: Fits standard concrete slab depths without a structural accommodation — avoids the cost and schedule hit of coordinating a deeper pour pocket with the structural engineer on renovation jobs.
• Cast-Iron Body: Unlike sheet-steel alternatives, cast iron won't rack or deform when a loaded AV cart crosses the cover plate repeatedly — relevant in training rooms and presentation spaces where wheeled equipment is routine.
• 11.63 × 14.25 in Plan Footprint: Sized for four-gang RFB Series cover plates without custom adaptation — the footprint lands within the standard template dimensions, keeping rough-in straightforward for the electrical sub.

Deployment Considerations:

• Coordinate the RFB4-CI-1 position on the architectural reflected ceiling plan before the concrete sub mobilizes — repositioning after the pour is a core drill and patch operation, not a quick fix.
• TAA compliance is not supported on this SKU; if this installation falls under a federal procurement vehicle or GSA schedule, flag it before the purchase order is cut.

The RFB4-CI-1 is the right call for a boardroom or multi-use training facility where the finish-floor plan calls for flush AV connection points and the structural slab is standard-depth poured concrete — it handles the mechanical demands of that environment without overcomplicating the rough-in.