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'''Aprilaire 350'''- Self Contained Discharge to Register'''Aprilaire 350'''- Self Contained Discharge to Register: this unit is mounted between floor joists, probably in a basement, and is to be connected to a duct leading to the level above.'''Aprilaire 360'''- Self Contained Thru the Wall'''Aprilaire 360'''- Self Contained Thru the Wall: this unit is a stand alone unit requiring no duct work. Mount in a wall between two rooms, it takes air from one room and circulates through to the other applying humidity.