Abstract: An agricultural silo comprising a plurality of vertically spaced apart silage discharge orifices includes a double passage chute overlying the orifices. The chute includes a first passage permitting unobstructed operator access and a separate silage discharge passage which confines the silage during the unloading operation. A dormer door provided in the silo top may be opened to discharge silage therethrough into the silage discharge passage. When opened the door vents the silo and when closed the door prevents material from entering the climbing and discharge chute during silo filling and prevents updrafts in the chute during unloading. A frame affixed in a dormer space at the top of the silo and chute defines a dormer opening of substantially the same size as the discharge orifices for snug mounting of an unloading transfer conduit therein.