The Astronics / EADS / Racal 456271 VXI Mainframe Airflow Directors are a set of six single-slot passive cooling components designed to optimize airflow distribution within VXI mainframes. Installed in empty slot positions, these directors redirect otherwise wasted airflow to enhance thermal management of adjacent populated modules and prevent localized overheating.
Technical Specifications
• Part Number: 456271
• Quantity: Set of 6 units
• Component Type: Single-slot VXI airflow directors
• Installation Method: Rear and center hook engagement into card guide holes
– Key Features
• Passive airflow redirection—no power or control signals required
• Designed for placement in empty VXI slot locations to manage thermal flow
• Balanced airflow distribution when spaced evenly across low-density module configurations
• Recommended deployment: maximum six directors per mainframe to maintain optimal circulation patterns
– Typical Applications
These directors address thermal challenges in VXI test systems operating with variable module population. They are particularly effective in configurations where C-size and B-size VXI modules occupy non-contiguous slots, creating airflow bypass paths. By filling empty adjacent slots, the directors prevent cool inlet air from bypassing hot modules and ensure efficient heat extraction.
– Compatibility & Integration
Supported Mainframes:
• Racal 1261A
• Racal 1261B
• Racal 1269
Module Compatibility: C-size and B-size VXI modules (via adjacent slot management)
Installation requires no modification to the mainframe or modules. The directors integrate directly into the existing card guide infrastructure using standard hook-and-hole mechanical attachment. For systems with sparse module loading, spacing the six directors evenly prevents localized pressure zones and maintains uniform thermal performance across the chassis.
