Cisco 3900-FANFLTR-NEBS

The Cisco 3900-FANFLTR-NEBS is a fan filter for Cisco 3900 series routers that is compliant with NEBS (Network Equipment-Building System) standards. NEBS is a set of standards developed by Telcordia Technologies (formerly Bell Communications Research) that define the requirements for telecommunications equipment to ensure their reliability and safety in a network environment. The Cisco 3900-FANFLTR-NEBS is designed to provide additional protection to the router's internal components by filtering out dust and other particles from the airflow, thus helping to maintain optimal performance and prevent damage.