Add 1 foot for each outside corner.
All hidden hangers will be provided for two foot increments for aluminum gutter.
Downspout elbows come in two styles, A and B. "A" style is where you can view the widest part of the elbow; "B" style is where you see the thin side of the elbow.
One tube of sealant will be provided with each order up to 5 corners.