VENTILATION The process of supplying or removing air by natural or artificial means to or from any space, such air may or may have not been conditioned.
VENT A pipe installed to provide a flow of air to and from a drainage system or to provide circulation of air within such system to protect the trap seal from siphonage and backpressure.
VENT STACK, MAIN VENT A vertical vent pipe installed primarily for the purpose of providing circulation of air to or from any part of the building drainage system.
STACK VENT, SOIL AND WASTE VENT The extension to the open air of a soil or waste stack above the highest horizontal branch drain or fixture branch connected to the stack.
INDIVIDUAL VENT/BACK VENT Type of venting system where the vent connects with a single fixture trap, usually at the back and extends vertically and connects with a stack vent, a vent stack or branch vent.
CIRCUIT VENT A branch vent which serves two or more traps and extends from in front of the last fixture connection of a horizontal branch to the vent stack. Circuit venting can be used when two or more fixtures, such as lavatories, are installed in a row. The circuit vent is connected to the waste drain line between the last two fixtures in the row. Then the circuit vent is connected to the main vent.
LOOP VENT A VENT ARRANGEMENT FOR A GROUP OF PLUMBING FIXTURES, CONSIST OF A VENT PIPE WHICH IS CONNECTED TO THE WASTE OR SOIL BRANCH IMMEDIATELY BEFORE THE FIRST FIXTURE OF THE GROUP.
LOOPED VENT A type of ventilation system used on fixtures in a room away from a wall or partition.