The Supply Duct Kit allows a limited amount of duct work to be attached to the intake on Quest Dual 110 & 150 Dehumidifiers so it can be located outside of the indoor garden. It includes two 10 inch duct collars, screws and foam for securely sealing to unit. Also includes optional plate to block air from one side. Be sure to also purchase the Return Duct Kit (part #310783 or #310785) to attach duct work to the air outlet and send dry air back into the garden. This 10 inch flange fits the Quest Dual 110 & 150 Dehumidifiers only.