Acura NSX 2020 Owner's Manual page 158

uuClimate Control SystemuUsing Automatic Climate Control
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Switching between the recirculation and fresh air modes
Press the (recirculation) button and switch the mode depending on
environmental conditions.
Recirculation mode (indicator on): Recirculates air from the vehicle's interior through
the system.
Fresh air mode (indicator off): Maintains outside ventilation. Keep the system in
fresh air mode in normal situations.
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