Most downspouts are rectangular but they can also be round or square.
Rain gutter downspout sizes.
Gutter professionals have experience matching the gutters and the downspouts.
The sizes available in this style are 3 4 5 and 6.
For example a 6 inch k style gutter requires a 3 x 4 downspout while a 5 inch k style gutter uses a 2 x 3 downspout.
As far as downspouts go they run at 2 x3 and 3 x4 in size or 3 or 4 inches in diameter.
This type of down spout is considered the standard downspout style in households and is used with a 5 k style guttering system.
It also comes in sizes 2 3 and 3 4.
Round downspouts come in various sizes and colors and mostly used with half round gutters.
The larger a gutter downspout the more water it can drain quickly.
The size of the downspout should be constant through out its length.
Downspout sizing in sizing downspouts the following considerations apply.
Gutter downspout sizes are 3 to 6 inches.
Downspouts of less than 7 00 sq in 4515 sq mm cross section should not be used except for small areas such as porches and canopies.
However too large a gutter downspout can look unattractive.
The second most common style of downspouts in urban homes is the rectangular downspout coming under a range of sizes.