reasons for sneezing chickens

[mapurcel]

following for updates, I have one that would give the occasional sneeze for about 2 weeks now. no discharge from eyes or nose and acts normal.

I knocked down one of the 4x1’s on the lower part of the roof and covered the opening with hardware cloth. I plan to do the other section once I get a crowbar (that additional wood sealant I added is no joke). So far the girls definitely sneeze less and have less dirt around their nares. I think once I make the second opening I’ll be in good shape.