#no called and left voicemail 8/6/19 #No Existing ductwork return 18 inch zone system supplies 12 inch Parts list ductwork 2-14†motorized dampers, 1 why 14x12x12, 1-14 to 12 reducer, 1-14 inch elbow, 14 inch KD pipe 6’ in length , 1 motorized damper 16â€, 1 why 16x12x12, 2-14 inch start collar‘s, 1-16 inch start collar