To what altitude does the ECS use recirculation?

The Environmental Control System (ECS) in the Dassault Falcon 7X utilizes recirculation at an altitude of 14,000 feet. This is a crucial aspect of cabin pressurization and airflow management in the aircraft. At this specified altitude, the ECS is designed to optimize the use of cabin air by recirculating a portion of it to maintain comfort and reduce the load on the air conditioning system.

By engaging recirculation at this altitude, the ECS can maintain a consistent and comfortable environment within the cabin, while also conserving the amount of fresh air that needs to be introduced from outside. This not only enhances passenger comfort but also contributes to the efficiency of the system, making optimal use of available resources while flying at higher altitudes where external air pressure and temperature can pose challenges.

The other altitude options presented do not reflect the operational design of the ECS concerning recirculation, as each system is tailored to function effectively within certain parameters to ensure efficient cabin pressure management and passenger comfort during flight.