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Middle Atlantic EFB45BTBZ Evolution Series Flush Solid Floor Box Cover, Bronze

Overview

The Middle Atlantic EFB45BTBZ is a flush-mount solid lid cover designed for the Evolution Series (EVO) floor box line. At 9.94 inches wide and just 1.19 inches tall, it sits nearly level with the finished floor surface — the right choice when you need a clean, unobtrusive termination point for in-floor power and data infrastructure in corporate lobbies, boardrooms, open-plan offices, or AV-integrated spaces. The bronze finish coordinates with complementary architectural hardware, making it a practical fit in environments where exposed floor infrastructure is a design consideration, not just a functional one.

The EFB45BTBZ pairs with standard receptacle configurations in the Evolution floor box system, covering the outlet assembly flush without raised edges that create tripping hazards or conflict with finished flooring materials like carpet tiles or hardwood overlays.

Key Features

• Flush Cover Style (1.19 in / 3 cm profile): The 1.19-inch height keeps the cover profile tight to the floor — minimizing trip hazard exposure and maintaining ADA-relevant surface compliance in high-traffic areas. If your floor box spec calls for a raised or angled lid instead, that's a separate SKU; this one is flat flush only.
• 9.94-Inch Width (25.2 cm): Sized for the EVO 45-series floor box footprint. Confirm your rough-in box dimensions match before ordering — a cover that's even a quarter-inch off won't seat properly and will leave gaps at the floor surface.
• Solid Lid Design: No cutouts, no port openings — the solid lid closes off the floor box completely when receptacles aren't in active use. This matters in cleaning-intensive environments (convention centers, event spaces) where liquid ingress around open port covers is a real concern.
• Bronze Finish: The bronze color coordinates with brass-adjacent architectural hardware. In environments where silver/chrome finish floor boxes look out of place — think warm-toned hardwood floors, traditional boardrooms, hospitality venues — the bronze option avoids the visual mismatch that a standard brushed nickel lid would introduce.
• Standard Receptacle Type Compatibility: Designed for standard receptacle configurations within the Evolution floor box system, not specialty or communications-only variants. Verify your installed box's receptacle type before specifying this cover.

Integration and Compatibility

The EFB45BTBZ is part of Middle Atlantic's Evolution Series floor box line and is designed to cover the EFB45 floor box base. It is not a universal floor box cover — it is sized and keyed specifically for the EVO 45-series footprint. If you're specifying floor box covers across a mixed installed base, verify the base model before ordering to avoid mismatched cover-to-box fits on the job site.

For AV and security integration projects where Middle Atlantic rack and infrastructure products are already specified, the Evolution floor box system provides a consistent product-family approach to in-floor termination. If you're planning a full structured cabling deployment that includes floor boxes, coordinate cover finish selections early — finish changes post-installation require a full cover swap, not a field refinish.

Frequently Asked Questions

Q: What floor box base does the EFB45BTBZ cover fit?

A: The EFB45BTBZ is designed for the Middle Atlantic Evolution Series EFB45 floor box base. It is not a universal cover — confirm your base model matches the EVO 45-series footprint (9.94 in / 25.2 cm width) before ordering.

Q: Is the EFB45BTBZ a flush or raised cover?

A: It is a flush cover. The total height is 1.19 inches (3 cm), designed to sit level with the finished floor surface with minimal protrusion.

Q: Does the EFB45BTBZ have any port openings or cutouts?

A: No. The EFB45BTBZ has a solid lid with no cutouts or port openings. It is intended to fully close off the floor box when receptacles are not in use.

Q: What finish color is the EFB45BTBZ?

A: Bronze. This finish is suited to warm-toned architectural environments where standard brushed nickel or chrome finishes would create a visual mismatch.

Q: Is the EFB45BTBZ compatible with communications or data receptacles?

A: The EFB45BTBZ is specified for standard receptacle configurations. It is not confirmed for specialty communications-only or data-only receptacle variants — verify your installed box's receptacle type against the Evolution Series compatibility matrix before specifying.

Eden Phillips

The EFB45BTBZ is one of those spec decisions that looks trivial until you're doing a punch-list walk at final inspection and the floor box cover doesn't seat flush or the bronze finish reads as orange under the lobby lighting. At 1.19 inches tall and 9.94 inches wide, this cover is dimensionally committed to the EVO 45-series base — it will not adapt to other floor box systems, so the first thing I check on any project spec is whether the rough-in box on the drawings actually matches this footprint.

Technical Highlights:

• 1.19 in flush profile: At under 1.25 inches, this sits close enough to finished floor height that it won't catch chair casters or rolling AV carts — a real issue with raised-lid covers in presentation spaces where furniture is constantly repositioned.
• Solid lid construction: No open port cutouts means no liquid ingress path when the floor box isn't in active use. In hospitality or event venues where floors get wet-mopped or beverage spills happen regularly, a solid lid is the correct cover type — not a convenience, a maintenance decision.
• Bronze finish: The EFB45BTBZ's bronze color matches warm-metal architectural hardware palettes (antique brass, oil-rubbed bronze door hardware) that appear in high-end hospitality and corporate interior specs. Specifying the wrong finish here is a visible defect — it's one of the few AV infrastructure items the end client will notice by eye.

Deployment Considerations:

• Confirm the installed EFB45 base receptacle type is standard before ordering — the cover is specified for standard receptacle configurations, and a mismatch at the base level means the cover won't install correctly regardless of the footprint match.
• The 9.94-inch width is fixed; there is no field adjustment. If the rough-in box is set even slightly off-center relative to the finished floor tile grid, the cover reveal will be visually asymmetric — worth flagging to the GC before the floor finish goes down.

The EFB45BTBZ is the right cover spec for warm-finish corporate boardrooms, hospitality pre-function spaces, and presentation suites where in-floor power infrastructure needs to disappear visually when not in active use — and where a solid lid is preferable to an open-port cover for maintenance and spill reasons.