How do I remove defrost vent on dash?

TrailBeast said
When all else seems to fail I have a 4 inch crescent wrench I use for things like that.
Yea, it's a pain and takes patience but it works.
On that broken vent I would start snapping it off in small pieces from the top side.

A 4-in crescent will not fit in there it's tight I think maybe starting to snap off the top might be an idea