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There isn't a single number for every set up. It should be at least wide enough that the roof comes down far enough for the drip edge to be lower than the top of the wall. That depends on the slope of the roof and the dimensions of the rafters, and how deep the notches in the rafters are where...

I would do soffits and ridge vents and not gable vents. I did and the air flows up the underside of the roof from the soffits to the ridge vent. It does not flow across from side to side unless the windows and doors on more than one side are also open. This is so even though 7' of the 8' of one...