The EX3400-FAN-AFI is a spare fan designed for Juniper EX3400 switches, specifically engineered for back‑to‑front airflow orientation. This component supports the cooling architecture of the EX3400 chassis, ensuring continuous operation and thermal management in data center environments. It is intended to replace a failed or degraded fan without requiring a full chassis replacement, allowing for quick, targeted maintenance. The unit is compatible with the standard EX3400 fan mounting and power specifications, providing a reliable, low‑profile solution for maintaining optimal switch performance and reliability.