The water vapor is in the air, so, no. You could install some barametric dampers in place of the 6 x 10's. This building is being kept at a specific temperature and humidity level. If you start changing the equipment or building setup; you might get yourself in more trouble than you want. I would get some bi wigd blessing prior to changing anything. Now, I would definatly sell them a blower motor, and have it staged on-site for when their IDM burns up. A far as the blocked TXV, I would think there is no corelation between the lack of exhaust and refrigerant resrtiction.