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USAV-880B vent size

I need to replace the radiator air vent in my bedroom (not venting air) and want to get something of better quality.
I see online that there are different sizes of vents designed for different parts of the heating system. Does anyone know what size the USAV-880B vent is? I can’t find anything on it.

I likely need to revamp the venting throughout my house anyways, but looking to get a clearer picture of what I have.