Active cooling flaps

[bb1]

Does anyone knows how active cooling flags on the front bumper works ?
Seems to be open all the time, but maybe only changes while driving ?

 

[PrudentOcean]

I read somewhere that they are always open when parked to prevent them from freezing in place in a shut position. You would think that in freezing conditions there would be little need for cooling, but what do I know.