Sorry for delayed response.
@zubairali89
I got it checked from KIA dealer and surprisingly, while checking there and placing hand near the duct, the air flow was normal.
So, what the representative guided is that due to climate control, vent usually controls the air flow and hence what i experienced previously was due to the fact that car temperature was good enuf to limit air flow to minimum.
Nevertheless, my personal observation is that the angle and duct position is such that it is not properly directed towards feet and hence we as driver doesn't feel the air flow.
Atleast, mentally i am satisfied now that there is duct and that it is working fine (not choked)
You may also check this personally by setting air flow to max, setting air flow position to feet and observe by placing hand. Hope this helps and work