The size is not specified for access panel !

Update:Apr 28,2022
Summary:The size is not specified.If you need to get into the ceiling, most of the openings are 500x500. If you don't need to get into the ceiling, 300x300 ca......
The size is not specified.
If you need to get into the ceiling, most of the openings are 500x500. If you don't need to get into the ceiling, 300x300 can be used.
Now the finished manhole is mostly used. First, it is beautiful, and then the manhole is relatively regular.