Can someone please tell me what this is/does

[Rog2210]

Hi all, my son and I were recently removing the blower motor out from my sons Rover 75 Tourer 2.0 CDTi, and he's accidentally broken a white piece of plastic under the driver side of the dash which looked a bit like a little fog horn/funnel!

The plastic was on the end of a tube that leads to a very small grill behind the left hand side of the steering wheel, it looks to be an air intake for when recirculating air within the car. We are trying to find out if it's something we need to replace, and what part we need to be looking for if so!

Thanks in advance for any help.