Rienza bench seats

Hi. Can anyone tell me what the vent type things are under the middle of the bench seats? Maybe just vents but they seem a little bit odd for just vents.

I have just been out to our Rienza to confirm you’re question about the vents. The only vent in middle at the back is the outlet for the blown air heater. Maybe yours is different to ours. If yours is different try posting a picture.