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How much fall in a toilet drain pipe?

Answer:

From various sources I gathered that the minimum fall (slope) is 1cm fall over 1m distance. Converted that is 0.125 (1 eighth) inch fall over 1 foot distance.

The maximum that should not be exceeded is 1cm fall over 20cm distance. Converted that is 0.25 (1 quarter) inch fall over 4 foot distance.

First answer by ID3325479494. Last edit by ID3325479494. Question popularity: 1 [recommend question].

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