Toyota 2012 Prius C Owner's Manual page 260

3-1. Using the air conditioning system and defogger
Switching between outside air and recirculated air modes
Press
The mode switches between outside air mode (the indicator is off) and
recirculated air mode (the indicator is on) each time the button is
pressed.
Adjusting the position of and opening and closing the air outlets
Center outlets
Right and left side outlets
240
.
Direct air flow to the left or right,
up or down.
Direct air flow to the left or right,
up or down.