Santa Fe Dehumidifier Duct Kit, Supply Only (4033039) is an add-on to duct the 2 outlet vents of these dehumidifier: Advance2 and Force. Duct work is useful if you need to hide the dehumidifier, need to dehumidify an otherwise inaccessible area or pump air from one room to another. The collar of this kit will attach to the sides of the dehumidifier where the dry air will blow out. If only one side is ducted, there is a duct plate that is included to cover the other outlet vent. The supply collars are 10 inches in diameter. To duct into another room, you need to use a 10" duct that is sold separately.