I have a whole house attic fan. I think a lot of it depends on your layout. Our house is two stories with a basement. The fan is in the attic. There are louvers at the top of the stairs. You definitely feel air movement through every open window, but not enough to disturb Timber. If you had a small area, well sealed, with the fan close, you probably could have a strong enough flow to disturb the flight path of a smaller bird, as Sterling said. FYI, yes, it saves us a lot on A/C. When the weather starts warming up, we turn the fan on at night. Then, we close the windows and turn off the fan when we get up in the morning, or when the temp outside starts climbing. It makes a big difference!