Abstract: A large capacity gutter includes a gutter member, a top hanger, a face support bracket, a lower mounting hanger, and a Z-bracket. A gutter cleat extends from the gutter member and is inserted into the lower mounting hanger. The top hanger preferably includes an upper building mount member, a lengthwise support member and a gutter support projection. The face support bracket preferably includes an L-building mount member, an L-lengthwise support member and an L-vertical member. The lower mounting hanger includes a lower building mount member, and a lower hook portion. The Z-bracket preferably includes a top member, an angled member, and a bottom member. An alignment bar is used to suspend the lower mounting hanger from the building, so the lower mounting hanger may be fastened to the building. The top hanger, the face support bracket and the Z-bracket are assembled to each other and inserted into the gutter member.