Indoor or outdoor drainage — what is the difference
Both pipes can be grey — but the class differs. Drainage guide.
| Indoor (HT) | Outdoor | |
|---|---|---|
| Environment | Room, stack, local lines | Ground, frost, load |
| Examples | HT DN50, HT DN110 | Outdoor PP/PVC/PE per project |
| Mistake | Fitting outdoor “because thicker” | Fitting HT outdoors without protection |
Diameters: DN explanation. Drainage.
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