36 X 9 X 1 Triangle Front Flange Custom Louver Exhaust Vent

https://onyxxteriors.com/info/explore/36-X-9-X-1-Triangle-Front-Flange-Custom-Louver-Exhaust-Vent.php

So thin that the louvers only have 3/4" of ventilation between the slats.

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Triangle custom louver exhaust vents

The face of the vent is lined with a 2 1/2" face trim.

And 1 1/2" of that is the nail fin for neatly covering any gaps.

Also, acts as a finish trim.