This is the Supermicro AC MCP-340-00001-01 Dummy Fan, designed as a placeholder for a standard 40x28mm fan. It comes in a brown box and is often used in server chassis to maintain proper airflow dynamics or fulfill component requirements.
Ensure this dummy fan is compatible with your specific Supermicro chassis before installation.
MCP-340-00001-01 - Rubrik Go Supermicro AC MCP-340-00001-01 DUMMY FAN 40x28MM Brown Box