Middle Atlantic EFB6-3/4-11/4 EVO Series Rack Knockout Plate

Overview

The Middle Atlantic EFB6-3/4-11/4 is a knockout plate designed for use with Middle Atlantic EVO series rack enclosures. It fills unused knockout openings in the rack frame, maintaining a clean, organized enclosure interior and blocking unwanted airflow bypass paths that would otherwise short-circuit your cooling strategy. Specify this plate when your EVO rack has open knockouts that are not populated by conduit, cable management, or feed-through hardware — leaving them open creates both airflow and debris ingress problems in managed equipment environments.

Compatibility

Designed for Middle Atlantic EVO series rack enclosures. The part number encodes the knockout geometry: the plate covers a 3/4-inch by 1-1/4-inch knockout opening in the EVO frame. Verify your specific EVO enclosure model's knockout dimensions against these figures before ordering — Middle Atlantic EVO racks are available in multiple frame configurations, and knockout sizes vary by model. This plate is not a universal fit across Middle Atlantic's broader rack accessory lineup; confirm compatibility with your EVO enclosure documentation.

Installation Notes

Knockout plates in the EVO series are typically tool-free snap-in or friction-fit installations into the frame opening. No fasteners or adhesives are required under standard installation. Ensure the knockout opening is fully cleared of any remaining tabs before seating the plate. Once seated, the plate should sit flush with the rack frame surface. If you are populating multiple knockouts in a single enclosure, order one plate per opening — they are not ganged or multi-position.