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Draining Systems - Main Vents

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Vents protects traps against pressure differences that could cause them to siphon or blow out, leaving occupants unprotected against smell and potential contaminants from the sewer system.

Draining Systems - Main Vents
Pipe Size
(in)
Max. Drainage Fixture Units
(DFU)
1 1/4 1
1 /1/2 81)
2 24
2 1/2 48
3 84
4 256

1) No water closets permitted

  • at least one vent should terminate through the roof
  • air admittance valves within the building may be permitted (check local authority)
  • terminating vents in side wall may be permitted (check local authority)
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Related Topics

Dimensions of Pipes and Tubes

Pipe, tube and fittings sizes and dimensions. Inside and outside diameters, weights and more.

Related Documents

Cast Iron Soil Pipes - Dimensions

Dimensions of cast iron soil pipes.

Cleanouts in Draining Systems

Cleanouts provides access to the sewer for rodding.

DFU - Drainage Fixture Units

DFU are used to calculate the drainage flow from fixtures and the required capacities of sewer service systems.

Drain Pipes and Vent Stacks

Drain pipes and vent stack sizing.

Drains and Sewers - Capacities vs. Size

Drainage Fixture Units (DFU) connected to building drains and sewers.

Fixtures Trap Sizes

Recommended drain trap sizes for different types of fixtures

Horizontal Drainage Pipe - Required Slopes

Minimum pitch of horizontal drainage pipes.

Sanitary Drainage Systems - Volume Flow

Calculate expected volume flow load in sanitary drainage systems.

Sanitary Piping - Drainage Fixtures Unit Loads

Maximum Drainage Fixture Unit - DFU - loads in sanitary piping systems.

Septic Systems

Septic systems handles waste from drain systems.

Trap Sizes vs. Fixture Units

No. of fixture units and required trap size.

Waste Water Piping - Flow Capacities vs. Dimensions

In sewage piping and pumping systems the fluid flow rate must be kept within certain limits to avoid operating problems.

Water Supply Fixture Units - WSFU vs. GPM and Liters/sec

Converting WSFU - Water Supply Fixture Units - to GPM.

Water Supply Fixture Units WSFU

WSFU is used to calculate water supply service systems.

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