Plumbing Dictionary


Plumbing termonalogy.

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V

VENT STACK

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

VENT SYSTEM GAS

A continuous open passageway from the flue collar or draft hood of a gas-burning appliance to the outside atmosphere for the purpose of removing flue or vent gases. A venting system is usually composed of a vent or a chimney and vent connector, if used, assembled to form the open passageway.

VENT SYSTEM SEWER

A pipe or pipes installed to provide a flow of air to or from a drainage system, or to provide a circulation of air within such system to protect trap seals from siphonage and backpressure.

VENTED APPLIANCE Category I

An appliance which operates with a nonpositive vent static pressure and with a vent gas temperature above a value, both measured as specified in the appropriate nationally recognized appliance standard. They can be either draft hood equipped or fan-assisted combustion system appliances.

VENTED APPLIANCE Category II

An appliance which operates with a nonpositive vent static pressure and with a vent gas temperature below a value, both measured as specified in the appropriate nationally recognized appliance standard.

VENTED APPLIANCE Category III

An appliance which operates with a positive vent static pressure and with a vent gas temperature above a value, both measured as specified in the appropriate nationally recognized appliance standard.

VENTED APPLIANCE Category IV

An appliance which operates with a positive vent static pressure and with a vent gas temperature below a value, both measured as specified in the appropriate nationally recognized appliance standard.

VENTED ROOM HEATER

A vented self-contained, free standing, nonrecessed, gas-burning appliance for furnishing warm air to the space in which installed, directly from the heater without duct connections.

VENTED WALL FURNACE (RECESSED HEATER)

A self-contained vented appliance complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building, mobile home or travel trailer, and furnishing heated air circulated by gravity or by a fan directly into the space to be heated through openings in the casing. Such appliances shall not be provided with duct extensions beyond the vertical and horizontal limits of the casing proper, except that boots not to exceed 10 inches (254 mm) beyond the horizontal limits of the casing for extension through walls of normal thickness may be permitted. Where such boots are provided they shall be supplied by the manufacturer as an integral part of the appliance and tested as such. This definition shall exclude floor furnaces, unit heaters and central furnaces as herein defined.

VERTICAL PIPE

Any pipe or fitting that makes an angle of 45 degrees (0.79 rad) or more with the horizontal.

W

WALL HEATER, UNVENTED CLOSED FRONT

An unvented room heater of the circulator type, having a closed front, for insertion in or attachment to a wall or partition. It incorporates no concealed venting arrangements in its construction and discharges all products of combustion through the front into the room being heated.

WALL HEATER, UNVENTEDTVPE

A room heater of the type designed for insertion in or attachment to a wall or partition. It incorporates no concealed venting arrangements in its construction and discharges all products of combustion through the front into the room being heated.

WALL HUNG WATER CLOSET

A wall-mounted water closet installed in such a way that the fixture does not touch the floor.

WASTE

The discharge from any fixture, appliance, area or appurtenance that does not contain fecal matter.

Water distribution pipe

A pipe within the structure or on the premises that conveys water from the water service pipe, or from the meter when the meter is at the structure, to the points of utilization.

WATER HAMMER

A rattling of pipes that may occur from the hammer effect of stopping the flow of water through a high-flow faucet unless the required hammer supressor devices are installed.

WATER HAMMER ARRESTOR

A device utilized to absorb the pressure surge (water hammer) that occurs when water flow is suddenly stopped in a water supply system.

WATER HEATER

Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system.

WATER HEATERS Automatic instantaneous

The type which heats the water as it is drawn.

WATER HEATERS Automatic storage

The type which combines a water heating element and water storage tank, gas to the main burner being controlled by a thermostat.

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