What to look out for when installing a gable attic vent?
It will permit good air circulation. I put in a large one , about 24" from roof peak to the bottom of the vent. My roof had low pitch so the lowest cedar board was over 8 ft long. I used 1X6 cedar boards at about a 30 degree angle with about a 3" overlap ( end view). A little snow would blow in on rare occasion which was handled by laying a piece of plywood on the ceiling joists.