VENTING SYSTEM

ARTERIAL VENT

a vent serving the building drain and the public sewer

BLIND VENT

A vent pipe which terminates at the upper side of the fixture and does not connect to the drainage system, with the intent of cheating.

BRANCH VENT

A horizontal vent connecting one or more individual vertical back vents with the vent stack or stack vent

CIRCUIT VENT

a group of vent which starts in front of the extreme fixture connection on a horizontal branch and connects to the vent stack.

CONTINUOUS VENT

A vertical vent that is a continuation of the drain to which the vent connects

DRY VENT

A vent that does not carry liquid or waterborne wastes

DUAL VENT

Same as common and unit vent

GAS VENT

Factory built piping and fittings used to convey flue gases to the outside atmosphere

GROUP VENT

A branch vent which performs its functions for two or more groups

INDIVIDUAL VENT

A pipe installed to vent a fixture trap and which connects with the vent system above the fixture served or terminates in the open air

LOCAL VENT

A pipe or shaft which conveys foul air from a plumbing fixture or a room to the outer air

LOOP VENT

A vertical vent connection on a horizontal soil or waste pipe branch at a point downstream of the last fixture connection and turning to a horizontal line above the highest overflow level of the highest fixture connected there at the terminus of which is connected to the stack vent

MAIN VENT

The principal artery of the venting system to which vent branches are connected

RELIEF VENT

A vertical vent line, with the primary function of providing additional circulation of air between the drainage and the vent system or to act as an auxiliary vent on a specially designed system

SIDE VENT

A vent connected to the drain pipe theough a fitting at an angle not greater than 45 degrees to the vertical

SOUL STACK

A vertical soil pipe which conveys fecal matter and wastewater

STACK

A general term for any vertical line of soil, waste, vent or inside conductor piping

STACK VENT

The extension of a soil or waste stack above the highest horizontal drain connected to the stack. The uppermost end above the roof is called stack vent through roof (SVTR)

UNIT VENT

A single vent connected at the junction of two fixture drains, which serves as a vent for two traps

UTILITY VENT

A vent rises well above the highest water level of a fixture and then turns downward before it connects to the main vent or stack vent

VENT STACK

The vertical vent pipe installed for the purpose of providing circulation of air to and from any part of the drainage system

YOKE VENT

A pipe connecting upward from a soil or waste stack below the floor and below horizontal connection to an adjacent vent stack at a point above the floor and higher than highest spill level of fixtures, provided for preventing pressure changes in the stack.