I do not wear a mask when I clean the coop...I clean it once a month. I open the coop's 2 doors and both windows when I clean the coop. I use sand in the coop so the dust is at a minimum.
I love this article. I have 15 ISA browns and 2 turkeys. Originally they had a 12x12 coop and a 16'X32' run...my husband and I did not think that they were happy enough so we fenced in another 5600 square feet for them in a wooded area. I think they dance and sing now!