You can figure out for yourself (ballpark is all that's required, although you can *do* calculations if you really *want*) how much a given distance and angle of overhang will affect ventilation. Just put it in place (or imagine) and then look at what size opening remains between the overhang and the main roof beneath it. As long as the height of the opening is no smaller than the height of your existing vents, it will not decrease airflow meaningfully. You'd have to have really pretty STEEP and extensive covers to meaningfully damage your ventilation ability.
Although as mentioned you will not *want* to be dumping that much cold air right on the heads of sleeping chickens in winter, so you need to have a plan for dealing with that too, not just the rain-blows-in issue.
Good luck, have fun,
Pat
Although as mentioned you will not *want* to be dumping that much cold air right on the heads of sleeping chickens in winter, so you need to have a plan for dealing with that too, not just the rain-blows-in issue.
Good luck, have fun,
Pat
