Product review (5 stars): Broan Exhaust Fan
Great exhaust fan - very quiet.  Out of the box it is designed for non vented installation.  The fan must be configured (changed) for using vented installation.  I recommend getting assistance during the installation when attaching the fan to an overhead cabinet.  Connecting the fan to an existing exhaust vent can be difficult. I also recommend purchasing a damper during the installation (to keep cold air out of the house).