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                The size of the gutter is generally determined by the width of the upper gutter. This is also the most important size parameter. Other dimensions such as gutter depth and bottom width are proportional to the width of the upper mouth. If the product specification is K5, the upper mouth width is 5 inches, the others are the same; one inch is equal to 25.4 mm, K5.5 is converted into national standard 135 mm, K6 is 152 mm, K7 is 175 mm.

                When selecting the size, it should be noted that the opening size and height of the gutter should be consistent with the height of the cornice. The Chinese cement structure ditch is thicker (more than the foreign wood structure), so choose a size of 5.5 inches or more; in some luxury Large villas (large, thick, thick), multi-storey and co-constructed clubs should be 6 inches, 7 inches in size to ensure the size of the water and the appearance of the building. Some public buildings and clubhouses have high decorative requirements for the cornice. They can choose double-layer decorative trenches, which integrate the drainage and decoration of the trench. To be sure, the smaller the size, the lower the price should be.