Recirculation fans in the cabin air system are used to:

Replace bleed air entirely

Pressurize the cargo compartment separately

Cool the avionics bay

Reduce bleed air demand by mixing recirculated filtered cabin air with fresh bleed air

Correct

Explanation

Recirculating filtered cabin air reduces the amount of bleed air needed, improving engine efficiency while maintaining airflow.

Test yourself with random questions from Aircraft General Knowledge and all other ATPL subjects.