I moved to the 4th fl of a 4 story condo some months ago. When I moved here, I noticed dead flies in both bathrooms and both bedrooms, near the windows. Recently, the fly problem has gotten out of control and I have closed all ceiling air ducts and somehow, the damn flies are still finding their way in; though, a few of the ducts can't be opened/closed. It is driving me crazy. I do not understand how they are getting in when the ducts are closed in my master bath. Please help!
