Middle Atlantic 880W3 Steel Floor Box for Wood Floors — 3-Gang

Overview

The Middle Atlantic 880W3 is a three-gang steel floor box engineered for flush installation in wood floor surfaces. At 5 in wide, 3.5 in tall, and 12.5 in deep, the 880W3 fits standard floor cavity depths while providing three gangs of device capacity — enough room to terminate A/V, data, and power at a single floor location without surface-mount conduit runs. TAA compliant, making it suitable for federal, state, and municipal projects where Trade Agreements Act conformance is required.

Compatibility

The 880W3 is part of Middle Atlantic's 880W series and is designed for installation in wood subfloor and hardwood floor environments. It accommodates standard single-gang wall plate inserts across all three gang positions, supporting configurations that mix keystone jacks, decora-style outlets, HDMI/USB pass-throughs, and blank covers depending on the termination requirements of the space. Verify rough-in depth against your floor joist cavity — the 12.5 in depth requires adequate clearance below the finished floor surface. Not intended for concrete or tile floors; for those substrates, reference Middle Atlantic's steel or tile-rated floor box families.

Installation Notes

The 3.5 in height corresponds to the box's above-subfloor rough-in dimension, which must align with finished floor thickness to seat the cover plate flush. Width of 5 in governs the cutout template — confirm the cutout does not intersect floor joists before cutting. TAA compliance applies to the box assembly itself; verify any inserts or covers installed alongside also meet TAA requirements if the full assembly must comply for a government project.