Activating and deactivating the recirculation timer setting
The climate system's recirculation function helps shut out smog, smoke, exhaust fumes, etc. by reusing the air in the passenger compartment.
When the recirculation timer is activated, air recirculation will switch off automatically after 20 minutes.
Tap the temperature button in the middle at the bottom of the center display to open Climate view.
Tap 
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.Choose a setting under Recirculation timer to activate/deactivate the air recirculation timer.