I have no idea what you talking about? Original fan not pull air out, the original fan blow air in.
It is more efficient to pull air out of a tube or tunnel than pushing air in. If you put the ant in a tunnel then you turn the original fan around to pull air out.
Maybe, i would not bet on that.
But with 2 Fan (1 additional on the other end) its sure more effective to blow air on 1 side in, and pull on the other side out.
I would bet, lots, it is physics 101, what is easier, to push air into a small box or push air into a bigger box? Push or pull depends on where your mind is in relation to the force and if you are in a room with no air con pushing air in, then that bigger box of a room is a big as the world's atmosphere.
If I get time this weekend I will do some tests on my thoughts about upside down miners with push-push fans and report the results.