Div. B › Part 7 › 7.5 › 7.5.8 — Sizing of Vent Pipes

7.5.8.3 — Branch Vents, Headers, Continuous Vents and Circuit Vents

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(1) Branch vents, headers, circuit vents and continuous vents shall be sized in accordance with Table 7.5.8.3., unless they are individual vents or dual vents.

(2) For the purposes of Table 7.5.8.3., the length of a branch vent shall be its developed length from the most distant soil or waste pipe connection to a vent stack, stack vent, header or open air.

(3) For the purposes of Table 7.5.8.3., the length of a header shall be its developed length from the most distant soil or waste pipe connection to open air.

(4) For the purposes of Table 7.5.8.3., the length of a circuit vent shall be its developed length from the horizontal soil or waste pipe connection to a vent stack, stack vent, header or open air.

(5) For the purposes of Table 7.5.8.3., the length of a continuous vent shall be its developed length from the vertical soil or waste pipe connection to a vent stack, stack vent, header or open air.

Tables & Figures referenced

Table 7.5.8.3 : Sizing of Branch Vents, Headers, Continuous Vents and Circuit Vents : Forming Part of Article 7.5.8.3.

Loading Table 7.5.8.3…

OBC Definitions

Defined terms on this page

branch

means a soil or waste pipe that is connected at its upstream end to the junction of two or more soil or waste pipes or to a soil or waste stack and that is connected at its downstream end to another branch, a sump, a soil or waste stack or a building drain.

branch vent

means a vent pipe that is connected at its lower end to the junction of two or more vent pipes and that, at its upper end, is connected to another branch vent, a stack vent, a vent stack or a header, or terminates in open air.

circuit vent

means a vent pipe that serves a number of fixtures and connects to the fixture drain of the most upstream fixture, and “circuit vented” has a corresponding meaning.

continuous vent

means a vent pipe that is an extension of a vertical section of a branch or fixture drain.

developed length

means , when applied to a pipe and fittings, the length along the centre line of the pipe and fittings.

dual vent

means a vent pipe that serves two fixtures and connects at the junction of the trap arms.

fixture

means a receptacle, plumbing appliance, apparatus or other device that discharges sewage or clear water waste, and includes a floor drain.

fixture unit

means , when applied to a drainage system, the unit of measure based on the rate of discharge, time of operation and frequency of use of a fixture that expresses the hydraulic load that is imposed by that fixture on the drainage system.

header

means a vent pipe that connects two or more vent stacks or stack vents to open air.

individual vent

means a vent pipe that serves one fixture.

open air

means the atmosphere outside a building.

size

means the nominal diameter by which a pipe, fitting, trap or other similar item is commercially designated.

soil

means , except for the purposes of Part 8 of Division B, a portion of the earth’s crust that is fragmentary or such that individual particles of a dried sample may be readily separated by agitation in water, and includes boulders, cobbles, gravel, sand, silt, clay and organic matter.

stack vent

means a vent pipe that connects the top of a soil stack or waste stack to a header or open air and “stack vented” has a corresponding meaning.

vent pipe

means a pipe that is part of a venting system.

vent stack

means a vent pipe that is connected at its upper end to a header or is terminated in open air and that is used to limit pressure differential in a soil or waste stack.

waste pipe

means a sanitary drainage pipe that carries the discharge from a fixture directly to a waste stack, soil stack, sanitary building drain, branch or sewage system.

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