4" Round Aluminum Elbows
40 Degree
72 Degree
The average installation requires two elbows at the top and one at the bottom. If you are connecting your downspout into a drain tile, the elbow at the bottom is not necessary.
* The offset is the measurement of two connected
elbows.
* The degree of elbow you use is determined by the
overhang of your structure.
To determine the overhang, measure the distance between the wall of your building and the back of the outlet. An overhang of 9" will require 2- 72 degree elbows. If your overhang is greater than 9" you will need to insert a piece of downspout between the elbows.
An overhang of less than 9" will require 2- 40 degree elbows. This elbow combination also works when making a transition around a ledge or other protrusions.
You will need to reduce the size of the opening on the elbows and downspout when using either corrugated or smooth options.
