Have you had a situation where there is 2 stages of cooling employing individual fans. Now, one fan spins clockwise, thus spinning the second stage fan counterclockwise due to the manipulation of the powered 1rst stage fan. Keep in mind that the 2nd stage fan is not powered but is spinning because of the first stage fan. Now when the 2nd stage is enacted, the spinning 2nd stage fan is powered and it spins the way that it was spinning from the manipulation of the 1rst stage fan. As a result the second stage bumps out on hi head due to lack of air flow. This is on of the most strangest things I've seen from a rooftop unit???