Drainage Fixture Units (DFUs)

Section 890 Section 890.1330  Drainage Fixture Units (DFUs) a)         Values for Fixtures.  Drainage fixture units (DFUs) (see Appendix A.Table E) designate the relative load of different kinds of fixtures that shall be used to calculate the total load carried by a soil or waste pipe, and shall be used with the tables of sizes for soil, waste and drain pipes for which the permissible load is given in terms of DFUs. b)         Values for Continuous Flow.  For a continuous or semi-continuous flow into a drainage system, such as from a pump, ejector, air-conditioning equipment or similar devices, two DFUs shall be considered to be equal to each gallon per minute (gpm) of flow.