Bieber0815
2016-07-12 06:42:23
- #1
Then the connection to the downpipe has a smaller diameter than the downpipe itself. The classic box also acts as an extension; until now I assumed this had a functional reason that was necessary, but perhaps that only applies to "large" roof surfaces.The drainage is, as probably expected, in the roof, and the drainage flows from the facade at the back into the downpipe.