The tubing of a Solatube® Daylighting System is not designed for exposed exterior applications. As long as the exterior tube runs are encased for added protection, however, this type of application is possible. To accommodate multiple 90-degree turns, angle adapters are available that provide maximum flexibility while resulting in minimal light loss. Also, keep in mind that the roof components must be supported if they reside on the side of the structure rather than the roof.
Note: this type of application may void the warranty. Consult your Solatube daylighting expert for more information.