Drain - Horizontals and Stacks

How to Use:

1. Select slope. The default is (1"/8' or 1:96).
2. Enter DFU
3. The recommended building drain size will show on the right.
4. The maximum DFU that the recommended size can take and the margin, or safety factor, will also show.
5. Note: Since slopes are dependent on diameter, e.g., if d<100 mm, the minimum slope shall be 2%. Therefore, when you select slope as 1%,no matter how small the DFU you entered is , the recommended pipe size will be 100 mm. On the othe hand, flow from small DFU may not be fast enough reach the self-cleaning velocity. Thus, you may have to chose a smaller diameter.
6. Refer to plumbing code applicable to your project for minimum slope of a given size drain.