Copper Penny Aluminum Rectangular Downspouts are the standard for Copper Penny Aluminum K Style gutter systems. 2x3" downspouts are typical for a 5" K Style gutter system, however 3x4" downspouts can also be used and are considered a better alternative due to the larger amount of rainfall they can drain. 3x4" downspouts are typical for a 6" K Style gutter system.
Copper Penny aluminum resembles shiny new copper. It will not patina like pure copper.
2x3 = Gauge .019, 10 ft. lengths
3x4 = Gauge .019, 10 ft. lengths
Downspout diameters are sized according to the roof area they drain. The following is the general rule used in the industry:
2x3 = 600 sq. ft. of roof
3x4 = 1200 sq. ft. of roof