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The ones I have are just wire screen for the windows. I am going to be adding Plexiglas covers to stop the wind this winter.
Truthfully I think that OSB can't be anymore dangerous than paint. I doubt any glue fumes or other toxins are leached out. Many people use them in their houses...
I could be wrong but I also worry about the amount of glues used in OSB initially in a small coop. Chickens have such sensitive respiratory systems as it is my thinking is why take the chance? I would imagine if you have tons of ventilation when its really new it would be OK, but in super cold...