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a fitting device designed and constructed to provide, when properly vented, a liquid seal which prevents the backflow of foul air or methane gas without meterially affecting the flow of sewage or wastewater through it.
Trap
that portion of a fixture drain between trap and the vent.
Trap Arm
the maximum vertical depth of liquid that a trap will retain, measured between the crown weir and the top of the dip of the trap.
Trap Seal
a cylindrical conduit or conductor conforming to the particular dimensions known as "tube sizes" and denoted by its outside diameter or O.D.
Tube
a room space having a volume equal to at least 1.4 cu. M. of the aggregate input rating of the fuel-burning appliance installed in that space. Rooms adjacent and open to the space where the appliance is installed, through openings not furnished with doors, are considered a part of the unconfined space.
Unconfined space
an arragement of venting so installed that one vent pipe will serve two traps.
Unit Vent
an air pressure less than atmospheric. Also, implies siphonage in piping system.
Vacuum
a pipe or opening used for ensuring the circulation of air in a plumbing system and for for relieving the negative pressure exerted on trap seals.
Vent Pipe
the vertical vent pipe installed primarily for providing circulation of air to and from any part of the soil, waste of the drainage system.
Vent Stack
pipes installed to prvide flow of air to and from a drainage system or to provide a circulation of air within such system to protect traps seals from siphonage and backpressure.
Vent System
any pipe or fitting installed in a vertical position or which froms an angle of not more than 45 degrees with the vertical line.
Vertical Pipe
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