Middle Atlantic 428BL Flush Carpet Plate Blank

Overview

The Middle Atlantic 428BL is a blank flush carpet plate designed to close off unused floor box or carpet plate openings in commercial AV, security, and structured cabling installations. When a Middle Atlantic floor box or modular floor fitting position goes unused — whether during initial deployment or after a device is relocated — the 428BL drops in as a clean, finished cover that keeps the opening sealed and the floor surface professional-looking. It is a direct fit for installations where an open cutout is a trip hazard, a dust ingress point, or simply a visible gap that fails a facilities inspection.

Compatibility

The 428BL is designed for use with Middle Atlantic floor box and carpet plate systems that accept standard blank insert modules. It is intended for Middle Atlantic's modular floor fitting product family — confirm your floor box series accepts the 428 insert footprint before ordering. It does not carry any wiring, data ports, or power — if the opening requires active connectivity, pair it with the appropriate Middle Atlantic modular insert (keystone, power, or audio/video) instead of this blank.

Installation Notes

Installation is tool-free in most configurations — the 428BL drops into the opening and seats flush with the surrounding carpet plate surface. Verify the host floor box is fully seated and the subfloor cutout is clean before inserting the blank; an uneven mounting surface will prevent the flush fit the plate is designed to deliver. Because no wiring or termination is involved, there are no torque specs or wiring requirements. This blank does not include any gasket or environmental seal — it is intended for indoor, climate-controlled environments typical of commercial office, command center, or security operations deployments.