Originally Posted by
AerocatS2A
A320 on ground, the outflow valve fully opens, so that’s where the air goes if the doors are closed.
The reason for my question is that I have been involved in some testing to investigate movement of virus particles on the aircraft. We have results on ground (with APUs) and in flight. In flight results show virus particles released in the back third of the aircraft tend to move toward the aft outflow valve, but on the ground, there is considerable movement toward the center of the aircraft (mix manifold). The in flight results make sense to us, but we are confused about the on ground results. Any insights would be helpful.