True 8/12 roof pitch.

This is where we can really see that some tiny vents are too small to vent.

At 24 inches on the base and 8 inches high in the center,

it would have had some ventilation.

But it was ordered not as the vent size measure,

instead, as the outer flange measure.

This makes the triangle vent even smaller.

Shop these Triangle aluminum attic exhaust vents

The vent was reduced to ensure the flange measures do not exceed the measures.

https://onyxxteriors.com/info/explore/24-X-8-X-1-Triangle-Front-Flange-Aluminum-Attic-Exhaust-Vent.php