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Rectangular Downspouts

Downspout diameters are sized according to the roof area they drain.

The following is the rule of thumb used in the industry:

2x3 inch downspout for 600 sq. ft. of roof
3x4 inch downspout for 1200 sq. ft. of roof
 

GutterSupply.com has many selections of downspouts in: copper, aluminum, copper clad stainless steel, galvanized, and lead coated copper.

 

Products In This Category:
Product Code Description Material Retail Price Qty.
GLDSX23G26
 2x3 Downspout 26 Gauge Galvalume $20.44 / 10FT  
GLDSX34G26
 3x4 Downspout 26 Gauge Galvalume $27.33 / 10FT  

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