Probably not a good time to mention that all 3 baths and kitchen vent were being exhausted into the attic! We're taking care of that too! This is an earth contact home and moisture has been a biggie. 70+ humidity year-round. We have two 50pt dehumidifiers running all summer and they can't keep up. Motor died in one of them after two summers. I am also looking into the Delta-FL by Cosella Dorken. Got a sample, brochures and pricing and I am impressed. For an existing structure with little headroom to loose I think it's the way to go!