You can calculate it in 2 ways:

For homemade 1/4-round architect zinc gutter

Size: 13mm x 1/4"

Bredde: 67 cm

Rektangulær brønd 69 90 grader bukket flange SBS PF 5000, 200x50x1000 mm 0 grader rør fald - 45 grader rør ende Kunstskifer You can calculate it inRectangular roof well for horizontal installation, with flat flange Dimension: 200x50x1000 mm Material tube protection ring: Acid resistant, stainless steel AISI 316 EN 1. 4401 Material flange: Stainless steel AISI 304 EN 1. 4301 Membrane type: SBS PF 5000 Angle: 0 90 degrees Touching: Oblique The roof well is primarily used for horizontal installation in masonry crown. With the flat flange, the roof well is mounted at a level above the roof surface