This unit replaced a GE Profile unit that started rattling after 12 years of service. While the buttons are conveniently located at the front, the performance of the unit has left a lot to be desired. While the GE Profile unit had 2 fans, this one has only one. The Low and Medium settings are not effective in eliminating orders and the unit vibrates at the High setting.The unit is vented to the outside.  Not having a positive experience since we bought the unit 5 months ago.