Here's a picture of my coop & run that we completed over the summer. It was a complete redesign and expansion. It has 3 3/4 walls. The 3/4 wall goes out to the run. Question...what can I do about ventilation in the coop? Everytime I go in to clean it out, dust starts flying everywhere and now I have this congested cough that won't go away. I'm starting to use a mask now when I clean it but I can only imagine how it affects the chooks.. what can I do to provide ventilation and also provide a draft free coop during the colder months??