Two (2) Pipe Cleats are required for every 10 feet of downspout.
Three (3) Pipe Cleats are efficient for a straight 20 foot run.
For a 10 foot run, place (1) approximately 1 foot from the bottom and (1) one foot from the top.
For a 20 foot run, place (1) approximately one foot from the bottom, (1) in the middle and (1) one foot from the top.
