This accessory allows a limited amount of ductwork to be attached to the air outlet on Quest Dual dehumidifiers. This allows the dehumidifier to be located outside of the indoor garden. Be sure to also purchase the return/intake air attachment (part #310786) to attach ductwork to the air intake and pull moist air out of the garden. Fits the Dual 105, Dual 155, Dual 205 and Dual 215 only. Quest part number: 4028607 Supply duct kit for Dual 105, Dual 155, and Dual 205 models. Includes 2 10″ duct collars, screws and foam for securely sealing to unit. Does not include duct work or register grill. Best if used in conjunction with 4028610 and 4020175. Fits Quest Models: Quest Dual 105 – PN 4032270 Quest Dual 155 – PN 4031490 Quest Dual 205 – PN 4033060 Quest Dual 215 – PN 4035400