Photo with rear panel taken off, we can see fans speed controller - FanMagic®.
The inflow provides by the fan on the base, that supply fresh air. You can see a cable to supply FanMagic®
controller from chassis to be installed, rack fastening system, door ground wire.
The view through the door. You can see the autflow fan, temperature remote sensor fastened at the top, door tubular rubber gasket.