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The usual rule for chicken coops is 1 square foot of ventilation per adult, standard-size hen. IMO, the best test is to check inside the coop on a warm, sunny day. If it's hotter inside than out you need more ventilation.

In a wet climate where ventilation is critical you might consider a Monitor Roof. Mine is storm-proven, having come through Hurricane Florence bone-dry inside. It's too small for you (designed for 4 hens), but it clearly illustrates how to frame a monitor...