I feel less blow power at the ventilation opening at the passenger side. The driver side and the middle ones blow harder compared to the the ventilation opening at the passenger side. Is that normal?

Can anyone check this on his/her car?

Checked mine and no discernable difference, presumably the trunking may have seperated or possibly a blockage. Cheers

I checked the control wheel if it does not open the blow mouth. It functions OK. If I close all the others then it does blow hard. So no blocking. Any other suggestions or is it normal behaviour?