What is the normal size of the manhole?

Release time：2021-11-01　　　　 Time to browse

The commonly used dimensions of maintenance openings on the market are: 300x300350x350400x400450x40500x500, of which 400X400 is the most common. If the manhole needs to be accessible, it should be opened to more than 500x500 and exceed the shoulder width of the human body. Generally, when manufacturers do it, they will reduce it by 0.5cm to 1cm. For example, the measured size of 400X400 manhole is 390x390 to 395x395, so as to avoid the problem that the hole is too small to install. Therefore, the decoration master only needs to open the hole at about 400X400, and it doesn't matter if there is a slight deviation. Of course, if there is no way to open such a square hole or leave such a conventional size hole due to the actual needs of the construction site, we can only find the manhole manufacturer to make it in advance.