Gutters Industrial/commercial gutters are fabricated in three profiles and sizes. Because of their size, these industrial gutters will accommodate roof drainage for large roof areas such as schools, industrial plants, and shopping centers. The gutter and downspout is manufactured in 10'-0" lengths. Optional accesories for gutters include outsite support brackets, formed expansion joints, splice covers, welded miters and end caps, outlets, and welded downspout elbows.