Chargerman said:
Thanks for the advice.
I think the way the fan is designed to work is by sucking the warm air our of the room at ceiling height and then blowing it down the cavity to the diffuser. I don't think they are designed to do the reverse which would mount the fan low and then pull from the diffuser up high. The effect should be the same in my mind.
mrfjsf: I think you are right in that this fan in addition to my hall fan should create a loop of sorts to allow better circulation with the door open to the bath. I built the wall between the two bathrooms and don't remember crossbraces being put in. There is a plumbing soilpipe vent going horizontally and then up a cavity somewhere in there though. I will have to check that out further. There is a forced air duct and small opening under the door to prevent completely pressuring the master bath with the door closed.
Either way, as long as you are drawing from the top and blowing out the bottom into the master bath, it will work. I do HVAC for a living and while im no expert in psycrometrics and air flow/patterns, I have a good understanding of it....I can't see any reason why this theory wouldnt work.
Im fighting airflow right now in my own house with trying to get the warm air out of the hearthroom and up the stairs which you would think would be an easy task especially since the stairs are in the room next to the stove, but it just doesnt want to flow well for some reason. Im looking into incorporating a fan that goes between the floor joists and into my master BR to help get that hot air up and cold air back down. I just have to find a way to land power to it...I have nothing close by.
Hope this works for you, let me know the results if you do it.