1.2 16V 80ps air intake

A couple of centimeters after the intake's entering, there is a hole on the back side, can't be easily seen, it's better to palp it with the fingers. I closed it with duck tape, I'm not sure if it made any big difference to the temperature of the air going into the engine though.
So, the hole sucks hot air probably, and it's factory fitted, why is it put there in the first place?

Cheers!
 
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