Drawing of a NACA ram air intake, courtesy to the National Advisory... | Download Scientific Diagram
![File:Air intakes of RAM air for environmental control systems of Boeing 747-8I.jpg - Wikimedia Commons File:Air intakes of RAM air for environmental control systems of Boeing 747-8I.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/1/1f/Air_intakes_of_RAM_air_for_environmental_control_systems_of_Boeing_747-8I.jpg)
File:Air intakes of RAM air for environmental control systems of Boeing 747-8I.jpg - Wikimedia Commons
Fahad Naim - (B787)✓The ground cooling valve lets air go through the ram air circuit and across the heat exchanger. - This air cools the nitrogen generation system (NGS) air when the
![airliner - What exactly are those openings in the bellies of many jetliners? - Aviation Stack Exchange airliner - What exactly are those openings in the bellies of many jetliners? - Aviation Stack Exchange](https://i.stack.imgur.com/mJHRy.jpg)