Dryer vent question...pic included

Does anybody know what this square stucture is below the dryer vent?

This is a laundry room on the upstairs of a Condo.

Its partially open…looks like a missing screw.



Where’s the pic?

Can’t tell it’s out of focus.:smiley:

Where the lights on for that pic? :wink:

It’s a clean-out (no picture needed). . . :wink:

Micheal it was taken with white light Why can you not clearly see it? I concur with Jeff

My guess is it’s a make up air duct that someone hap-haphazardly capped off.
Was the dryer in a closet with a solid door?