Extron FOX3 I/O Blank Plate (part number 70-1121-01) — the single-slot filler panel for unoccupied I/O bays on Extron FOX3 Matrix 560x and FOX3 Matrix 840x fiber optic matrix switchers.

The FOX3 Matrix 560x and 840x frames carry 40 board slots each, and Extron's setup guide calls for a board or a blank panel in every slot during normal operation to maintain the chassis airflow path. This plate covers any slot that is not yet populated with a FOX3 I/O 88 board, sealing the opening so the switcher's fans pull air across the populated boards as designed rather than short-circuiting through an open bay. It is a simple, tool-installed panel with no active electronics.

Key Capabilities

• Single I/O slot coverage, matches the FOX3 Matrix modular board opening
• Maintains designed front-to-rear cooling airflow across populated boards
• Keeps unused bays sealed during staged or partial deployments
• Tool-installed captive panel screws, no electronics or configuration required

Where It Is Used

Integrators specify this plate whenever a FOX3 Matrix 560x or 840x ships or is commissioned with fewer than 40 I/O boards installed, and again any time boards are removed for service and the bay will sit open for more than a few minutes.

Specifications at a Glance

• Compatibility: FOX3 Matrix 560x and FOX3 Matrix 840x chassis
• Function: single I/O slot blank/filler panel
• Installation: tool-installed captive panel screws

Extron's own setup documentation for the FOX3 Matrix Series states that boards or blank panels should be installed in all locations during normal switcher operation, making this plate a required accessory rather than a cosmetic option on any partially populated frame.

Also referenced as Extron FOX3IOBlankPlate, FOX3-I-O-Blank-Plate, part number 70112101.