These were only made to house new birds away from all my other birds so I can monitor them to make sure they are not sick. They are not for use other then in winter. Conditioning may have been the wrong word. I've cleaned the legs, treated for lice, and wormed them. After about a month then they will go outside with their pairs or trios. Then the coops will be disinfected with tec trol.
As for air movement. There is two inline fans that are about 120cubic feet per minute. So highly unlikely they have stagnant air