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I meant at the very absolute peak of the roof -- where heat and ammonia will build up. The usual figure for ventilation is 1 square foot per bird minimum -- which doesn't count ventilation through the pop door that will be closed at night or through windows that are closed in the winter...

4'x5' is just right for 5 hens. Good job on that. You need more ventilation up at the roof level. Can you pull the soffit boards off and replace them with hardware cloth? And add more ventilation right at the top of the gable ends (unless you want to retrofit a ridge vent)? I'd suggest trying...