Hello everyone, 1st time posting here in this forum so thank you in advance. I have fixed all registers in my house - airsealing them to the sheetrock, priming all exposed wood and sheetrock edges, caulking all pin holes and seams of the registers and cleaning them as well. I have done this except for 1 register because the air duct in this location did not have a register...yeah, the contractor who was hired by the previous homeowner must've cheaped out on this job. This is the air vent for the kitchen, directly below the 2nd floor master bath. So I purchased one of the newer types of registers in which it smoothly directs the cool air down and the "flaps" of the register are meant to be trimmed and mounted to the outside / visible side of the ceiling. Mounting it required me to screw in a few scraps of 1/2" pinewood on the other side of the ceiling sheetrock so I have something to screw the register flaps onto as well as the vent diffuser. With all this work, I had to apply some compound to the screws and ceiling just to smooth out some of the work. The register is hanging just a bit, about 2-3 inches from the ceiling until I can sand, prime and paint around this opening. What I have noticed is that condensation has formed on the outside of the register, collecting on the flaps and eventually dripping onto the floor. Again, condensation is occuring on the side of the register that is not visible to me, or the side that is exposed to the "crawl space" between the ceiling and the floor of the master bath. condensation is not coming from the unit in the attic as I can go to the master bath and see that the air duct (8 inch round duct, wire reinforced, insulated). So, I am thinking this can be 2 things: 1) Since the weather is so hot, the air is extemely warm in that space between the 1st and 2nd floors and once it hits the cool register, the air condenses which is what is causing the water to drip off the register flaps. This isn't a good thing as this means that once I screw-mount this register to the ceiling, the condensation will have nowhere to go and cause the sheetrock to absorb it and possibly cause mold. Not good. 2) I'm hoping this is it. The fact that the register is not mounted yet, the warm air in the kitchen is able to travel up through this ceiling opening to this "crawl space" and then reacting to this cool register surface to condense. So once I am able to mount this register to the ceiling and caulk all remaining areas, then this will solve the condensation issue. If #2 isn't it, then I may be in trouble as all registers are in either this type of crawl space or in the attic and they are mounted in a similar fashion. If #1 is the case, then a lot of condensation must be happening at all of these registers and sooner or later, I will have issues at each register location. How am I supposed to prevent this from happening?

I have a Emerson WHF 302 2 speed belt driven attic fan can you tell me if it does use a start-up compacitor or is it all in the motor already and can you tell me how you would wire this it came with what is believed to be a timer not needed and a 3 wire switch off is in center and high and low positions and on the motor are 3 lugs as you can see in picture of the motor common,high and low [ATTACH]68997[/ATTACH] Thanks