天沟目前在市场上供应有的尺寸有5.5寸、6寸、6.5寸、7寸、8寸等系列，那我们该如何选择天沟的尺寸呢？

    天沟的尺寸规格一般是按照天沟上口的宽度决定的，这也是比较重要的尺寸参数，天沟深度及底部宽度等其它尺寸都随着上口宽度按比例变化。如产品规格是K5.5表明是上口宽度是5.5英寸，其它以此类同；一英寸等于25.4毫米，K5.5换算成国标是135毫米，K6是152毫米，K7是180毫米，K8是200毫米。

    在选择天沟尺寸时，主要应注意是檐沟的开口尺寸和高度要和檐口的高度吻合，中国水泥结构住宅檐口都较厚（较国外木结构）所以要选5.5英寸以上的尺寸；在一些豪华的大别墅（挑檐大，檐口厚），多层和共建会所等建筑，应选择6.5英寸，7英寸的尺寸，保证落水的尺寸和建筑的外观协调。而有些公共建筑和会所的建筑，对檐口的装饰性要求高，可以选择双层型装饰檐沟，它是把檐沟的排水和装饰性整合在一起。肯定的讲，尺寸越小，价格应越低

Tiangou is currently available in the market size of 5.5 inches, 6 inches, 6.5 inches, 7 inches, 8 inches and other series, so how should we choose the size of Tiangou?
The size of the trench is generally determined by the width of the upper mouth of the trench. This is also the most important size parameter. Other dimensions such as the depth and bottom width of the trench vary proportionately with the width of the upper mouth. For example, the product specification is K5 .5 indicating that the upper width is 5.5 inches, others are the same; An inch is equal to 25.4 mm, K5 .5 is converted into a national standard of 135 mm, K6 is 152 mm, K7 is 180 mm, and K8 is 200 mm.
When choosing the size of the trench, it should be noted that the opening size and height of the trench should be in line with the height of the cornice, and the Chinese cement structure residential cornice is thicker(more than the foreign wood structure), so the size of 5.5 inches or more should be selected; In some luxurious large villas(large and thick), multi-storey and joint building buildings should choose a 6.5-inch, 7-inch size to ensure that the size of the fall and the appearance of the building are coordinated. Some public buildings and clubhouse buildings have high decorative requirements. They can choose double-deck decorative ditches. It integrates drainage and decoration of ditches. To be sure, the smaller the size, the lower the price.