The Exhaust Duct Kit allows duct work to be attached to the intake on the Quest 506 Dehumidifier. This allows the dehumidifier to be located outside of the indoor garden. This two-piece kit comes with a duct adapter, collar plate and screws to install it. The collar plate has 12 in round collars. It is 27.57 in x 21.5 in x 4 in.