Additional circuit vent means a vent pipe that is installed between a circuit vent and a relief vent to provide additional air circulation.
Air admittance valve (cheater vent) means a one way valve designed to allow air enter the drainage system when pressure in the plumbing is less than the atmospheric pressure.
Air break means the unobstructed vertical distance between the lowest point of an indirectly connected soil -or-waste pipe and the flood level rim of the fixture into which it discharges
Air gap means the unobstructed vertical distance through air between the lowest point of a water supply outlet and the flood level rim of a fixture or device which the outlet discharges
Alloyed zinc means the alloy of zinc having the corrosion resistance and physical properties of an alloy containing 0.15% titanium, 0.74% copper and 99.11% zinc, and so tempered as to be capable of being formed into shape required for a watertight joint.
Auxiliary water supply means any water supply on or available to the premises other then the primary potable water supply.
Backflow means a flowing back or reversal of the normal flow of direction.
Backflow preventer means a device or a method that prevents backflow.
Back pressure means pressure higher then supply pressure.
Back-siphonage means backflow caused by negative pressure in the supply system.
Back-siphonage preventer (vacuum breaker) means a device or a method that prevents back siphonage.
Backwater valve means a check valve designed for use in a gravity drainage system.
Bathroom Group means a group of plumbing fixtures installed in the same room, consisting of one domestic-type lavatory, one water closet and either one bathtub (with or without shower) or one-head shower.
Branch means a soil-or-waste pipe that is connected at its lower end to the junction of 2 or more soil-or-waste pipes or to a soil-or-waste stack, and 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 the lower end of a junction of 2 or more vent pipes, and at its upper end , either to another branch vent or to a stack vent, vent stack or vent header, or terminates in open air.
Building means any structure used or intended for supporting or sheltering any use or occupancy.
Building drain means the lowest horizontal piping, including any vertical offset, that conducts sewage, clear water waste or storm water by gravity to a building sewer.
Building sewer means a pipe that is connected to a building drain 1 m outside a wall of a building and that leads to a public sewer or private sewage disposal system.
Building trap means a trap that is installed in a building drain or building sewer to prevent the circulation of air between a drainage system and a public sewer.
Care or detention occupancy means the occupancy or use of a building or part thereof by persons who require special care or treatment because of cognitive or physical limitations or by persons who are restrained from, or are incapable of, self-preservation because of security measures not under control.
Check valve means a valve that permits flow in one direction but prevents a return flow.
Circuit vent means a vent pipe that serves number of fixtures and connects to the fixture drain of the most upstream fixture.
Cleanout means an access provided in drainage and venting systems to provide for cleaning and inspection services.
Clear-water waste means water waste with impurity levels that will not be harmful to health and may include cooling water and condensate drainage from a refrigeration and air-conditioning equipment and cooling water and condensate drainage from refrigeration from a public water supply main only,with or without gravity storage or pump suction tanks.
Combined building drain means a building drain that is intended to conduct sewage and storm water.
Combined building sewer means a building sewer that is intended to conduct sewage and storm water.
Combined sewer means a sewer that is intended to conduct sewage and storm water.
Combustable means a material fails to meet the acceptance criteria.
Continuous vent means a vent pipe that is the extension of a vertical section of a branch or fixture drain.
Critical level means the level of submergence at which the back-siphonage preventer ceases to prevent back-siphonage.
Deadend means a pipe that terminates with a closed fitting.
Developed length means the length along the centre line of the pipe and fittings.
Directly connected means physically connected in such a way that water or gas cannot escape from the connection.
Drainage system means an assembly of pipes fittings, fixtures, traps and appurtenances that is used to convey sewage, clear-water waste or storm water to a public sewer or a private sewage disposal system, but does not include subsoil drainage pipes (weeping tile).
Dual vent means a vent pipe that serves 2 fixtures and connects to a junction of the trap arms
Dwelling unit means a suite operated as a housekeeping unit used or intended to be used by one or more persons and usually containing cooking, eating, living, sleeping and sanitary facilities.
Emergency floor drain means a fixture for the purpose s of overflow protection that does not receive regular discharge from other fixtures, other then a trap primer.
Fire separation means assembly that acts as a barrier against the spread of fire.
Fire service pipe means a pipe that conveys water from a public main or private water source to the inside of a building for the purpose of supplying the sprinkler or standpipe systems.
Fixture means a receptacle, appliance, apparatus or other device that discharges sewage or clear-water waste, and includes a floor drain.
Fixture drain means a pipe that connects a trap serving a fixture to another part of the drainage system.
Fixture outlet means a pipe that connects the waste opening of a fixture to the trap serving the fixture.
Fixture unit means (as applied to the drainage system) means 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.
Fixture unit (as applied to water distrubution systems