# Plumbing dfu

## How many DFU is 2 inch drain?

DIAMETER OF PIPE (inches) MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS (dfu)
2 6 24
21/2 12 42
3 20 72
4 160 500

2

## How many fixture units is a kitchen sink?

Drainage and venting fixture unit values

Individual fixtures Minimum size trap and trap arm b Number of units
Clothes, washer, domestic, 2-inch standpipe 2 inch 3.0
Dishwasher, domestic, with independent drain 1-1/2 inch a 2.0
Kitchen sink, domestic, with or without food waste grinder and/or dishwasher 1-1/2 inch a 2.0

## How do you convert GPM to DFU?

Regarding 1 DFU = 7.5 gpm (or 1 cfm), that is the actual measured discharge rate of a lavatory.

2 Toilets

## How do you know if your in DFU mode?

1 DFU = 1 cubic foot of water drained through a 1 1/4″ diameter pipe in one minute. 1 DFU ≈ (approximately) 7.48 US GPM or ≈ 0.47 liters/second.

## How many toilets can be on a 4 inch drain?

3 tank-type toilets , one urinal, 4 sinks.

9 DFUs

## What is a DFU rating?

DFU (Drainage Fixture Unit Values) is defined by the the Uniform Plumbing Code (UPC) and can be used to determine required drainage capacities from fixtures and their service systems. A fixture unit is equal to one cubic foot of water drained in an 1 1/4 pipe over one minute (≈ 7.48 US gpm, ≈ 0.47 l/s).

## Can a toilet shower and sink share a vent?

As a general rule, you will just be able to vent 2 fixtures on a toilet wet vent . 1) Toilet and Sink : The toilet is vented through the sink drain. The toilet drain should be 3″, the sink drain is 1.5″, the shared sink drain/ toilet vent area should be 2″, and the vent going up should be 1.5″.

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## How many fixtures can be on a 2 inch vent?

A 2 ” line will vent three bathrooms, as long as there are other vents in the system to equal the “area” of one three inch vent .

## What is considered a plumbing fixture?

: a part (such as a sink, toilet , faucet, etc.) that is attached to a system of pipes that carry water through a building.

## How do I convert WSFU to GPM?

1 WSFU = 1 GPM = 3.79 liter/min. 1 in = 25.4 mm.

## How do I calculate GPM?

The formula to find GPM is 60 divided by the seconds it takes to fill a one gallon container (60 / seconds = GPM ). Example: The one gallon container fills in 5 seconds. 60 / 5 = 12 GPM . (60 divided by 5 equals 12 gallons per minute .)

## How many GPM is a fixture unit?

‘ A Fixture Unit is not a flow rate unit but a design factor. A fixture unit is equal to one cubic foot of water drained in an 1 1/4 pipe over one minute. One cubic foot of water is roughly 7.48 gallons ( 6.25 Imperial Gallons). A Fixture Unit is used in plumbing design for both water supply and waste water.