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It's not healthy. But with adequate ventilation you don't get excessive dust hanging in the air. :)

The numbers you need to consider when thinking of the 1 square foot per adult, standard-sized hen are the the permanent, 24/7/365 vents that are never closed for any reason. All the rest is supplemental ventilation. :) For example, my outdoor brooder, an 8x4 structure, has 16 square feet of...

This. For 36 chickens you should have 36 square feet of ventilation. Those tiny gable vents are in the right place -- because heat and ammonia both rise -- but they can't possibly be moving enough air through them because the actual, unobstructed open area on one of them can't possibly be even...