The seamless sections of gutters are custom made in two sizes:
5 inch gutters
6 inch gutters
The downspouts are subsequently matched, with 2×3 inch downspouts connecting to the 5 inch gutters and 3×4 inch downspouts connecting to the 6 inch downspouts.
We always recommend the bigger gutters – 6 inches – because they come with the larger downspouts, thus they can displace more water and do it faster during storms! In fact, the extra inch on the downspouts leads to 400% more water volume, thus preventing gutter issues!