What flange type gable vent is needed?

https://onyxxteriors.com/info/flange.php

Quick tutorial on how to choose the correct flange for a gable vent.

Choosing the correct vent flange can make the install so much easier as well as choosing the wrong one making the install so much more difficult.

The flange is a preset to determine the install manor and determined by the existing gable wall settings.