Almost no air from the heater blower

I have this 1999 Micra facelift.

The heater blower/fan work fine in all 4 settings. But there's very little air getting out of the vents.
When I make it recycle the air, it works fine, but on fresh air, even step 4 gives almost no air...

I tried checking for any obvious blocking in the air intake under the wipers. And opening the glovebox to look behind it. And below... Does anybody know of any hoses or anything that I should check? Maybe something has fallen off?

Thanks in advance.

Ulrich
 
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