A dumb question: Wouldn't that Panasonic ERV just put the moisture back into the bathroom? I must be missing something.

As I said, they are not a bad install, typically 6 inch trunk to 2 out side locations, air in air out, then 6 inch trunk with metal y 6 to 4 and again 4 to 4 this provides 8 total 4 inch fixtures, 4 fresh air in ( bedroom x 3 plus living room) 4 bad air out (bath room x 2 + laundry & kitchen). Any configuration is possible this is one standard idea. The HVR Unit hangs on 4 short chains to minimize noise transference.
Dan

Following up on Dan's post talking about the typical ductwork for a HRV for 2000 sq ft house,.. For 4 supplies, would that be a 6" supply trunk with first (2) 4" branches, then a smaller trunk ending in the final (2) 4" branches?  If anyone could point me to some typical drawings showing duct sizes it would be appreciated!