AAV-One-way valve designed to allow air to enter the plumbing drainage system when negative pressures develop in the piping system. The device shall close by gravity and seal the vent terminal at zero differential pressure (no flow conditions) and under positive internal pressures. The purpose of an air admittance valve is to provide a method of allowing air to enter the plumbing drainage system without the use of a vent extended to open air and to prevent sewer gases from escaping into a building.
ACCEPTED ENGINEERING PRACTICE That which conforms to accepted principles, tests or standards of nationally recognized technical or scientific authorities. Where a standard is referred to in Chapter 4101:3-13 of the Administrative Code relative to “accepted engineering practice,” conformity to the applicable technical provisions, requirements, recommendations and determinations in the standard or other publications is prima fascia evidence of conformity with accepted engineering practice.
ACCESS (TO) That which enables a product, device, fixture, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see “Ready Access”).
ACCESS COVER A removable plate, usually secured by bolts or screws, to permit
access to a pipe or pipe fitting for the purposes of inspection, repair or cleaning.
ADAPTER FITTING An approved connecting device that suitably and properly joins or adjusts pipes and fittings which do not otherwise fit together.
AIR BREAK A piping arrangement in which a drain from a fixture, appliance or device discharges indirectly into another fixture, receptacle or interceptor at a point below the flood level rim and above the trap seal.
AIR GAP The unobstructed vertical distance through the free atmosphere between the outlet of the waste pipe and the flood level rim of the receptacle into which the waste pipe is discharging.
AIR GAP (WATER DISTRIBUTION SYSTEM) The unobstructed vertical distance through the free atmosphere between the lowest opening from any pipe or faucet supplying water to a tank, plumbing fixture or other device and the flood level rim of the receptacles.
ALTERNATIVE ENGINEERED DESIGN A plumbing system that is not specifically regulated by Chapters 3 through 12, but performs in accordance with the intent of Chapters 3 through 12 and provides an equivalent level of performance for the protection of public health, safety and welfare. The system design is not specifically regulated by Chapters 3 through 12 in accordance with the requirements of Section 106 of the building code.
ANTI-SIPHON A term applied to valves or mechanical devices that eliminate siphonage.
APPROVED Determined to be in compliance by the authority having jurisdiction in accordance with the rules of the board.
AREA DRAIN A receptacle designed to collect surface or storm water from an open area.
ASPIRATOR A fitting or device supplied with water or other fluid under positive pressure that passes through an integral orifice or constriction, causing a vacuum. Aspirators are also referred to as suction apparatus, and are similar in operation to an ejector.