02 Corolla AC Help Broken door Flap thing near Evaporator??

#1
Hi,
So I have my glove box out and had installed a new evaporator, valve, o rings, drier, and vacuum and recharged. There is cold air blowing out but not through the vents. When I was installing the evaporator this little door flap got pulled out and I didn't know if it was suppose to swing or what. what is this for? I really don't want to empty the system all over again. any ideas??
 
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