In response smacna s technical resources department has created a free downspout and gutter sizing calculator.
Smacna gutter profiles.
15 m is a practical maximum gutter length to be served by a downspout.
To limit the effects of thermal expansion in gutters 50 ft.
Technical paper 2017 update for architectural fascia and coping wind tests report.
Available in up to 32 0 lengths.
In addition to standard smacna profiles custom shapes are also available.
Dmi offers our box gutter in six standard smacna profiles see profiles tab below.
All smacna series gutters are sized by their rear dimensions.
Smacna s technical resources committee completed wind uplift testing on custom fabricated fascia and coping architectural elements.
Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist.
Custom profiles are also available.
Downspout sizes must not exceed the bottom width of the gutter.
Standard rain gutter profiles styles courtesy smacna box gutters like in style a above have the largest volume for the shape and amount of gutter material used were were finding favor in large commercial public and industrial applications by minimizing cost and maximizing water carrying capacity.