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Draining Systems - Main Vents

Vents in draining systems protects traps against pressure differences that could cause them to siphon or blow out .

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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.

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 - Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more.

Related Documents

DFU - Drainage Fixture Units - DFU are used to calculate the drainage flow from fixtures and the required capacities of sewer service systems.
Cast Iron Soil Pipes - Dimensions - Dimensions of cast iron soil pipes.
Cleanouts in Draining Systems - Cleanouts provides access to the sewer for rodding.
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 and 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 Size 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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