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The waste pipes should not be less than 38mm diameter and laid with a minimum fall of 15 degrees.
The run should be as short as possible, avoiding sharp bends, tee connections and stopped ends.
The waste should not discharge over a gulley or drain grating. Where a lengthy, or meandering run
pipe work is unavoidable, it is recommended that the pipe size be increased to 54mm diameter
immediately after the trap. It is stressed that most problems, and subsequent blockages, are traced
to unsuitable waste pipe runs.
IMPORTANT: The outgoing waste pipework must be below the unit outlet to ensure
that it drains completely.
Notes:
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