24 X 6 X 1 Triangle J Channel Garret Louver Exhaust Vent

https://onyxxteriors.com/info/explore/24-X-6-X-1-Triangle-J-Channel-Garret-Louver-Exhaust-Vent.php

If you could see inside the J channel pockets on the bottom and top, the vent size is 24 x 6 x 1.

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Triangle garret louver exhaust vents

The J channel around the vent is set for soffit or cornice on the top.

It is set for vinyl siding or wood siding on the bottom.