In the process of venting bathrooms fans outside, noticed this.
Inside picture of the opening. That is a 2x4 in the middle of the opening. Opening is only about 1.5” wider than the 2x4.
Am I wrong for thinking the cutout needs to be bigger?
If the opening needs to be bigger, how do I go about it? Set the saw for the thickness of the sheathing? My fear is cutting the insect screen. Just put more screen over it? Mend it back together?

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