Our recent camping trip was the first time we had a chance to use the air conditioner since we bought the new Big Horn. A large amount of air blew out immediately beneath the a/c, but very little came out of the ducts/vents in the rest of the trailer. During our walk through I seem to recall that something in the bottom of the a/c could be switched, slid or moved causing more air to be directed into the ducts. I looked, but could not figure out what this might have been. That's assuming I am remembering correctly. Can anyone help?