Pat & Chickens, I have read your excellent ventilation page, and it has taught me lots of things. But in case you thought it was idiot-proof... I volunteer to be the idiot! Is it possible to make a simple ratio of "ventilation square footage : chicken", or is that too dependent on temperature, humidity, prevailing wind speed and direction, and planetary transits? I have a shed on the property which I am considering converting (back?) to a chicken coop. It is 5' x 11', and the entire edge of the roof is passively vented, as the metal roof is resting on a grid of 2x4s which allows for free air circulation. It is no big deal to add more ventilation in the gables, and build a little indoor roof over the roost to prevent down-drafts, but I am just wondering (on everyone's behalf) if there is an actual formula. Thanks!