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I. D.:
Inside Diameter - All pipes are sized according to there inside diameter.


Immersion:
A term referring to something submerged in water.


Impeller:
Rotating wheel with vanes found inside a centrifugal pump. As it spins at high speed it draws fluids in and thrusts them under pressure to the discharge outlet.


Incoming Inlet Temp:
Temperature of water entering the tank.


Incomplete Combustion:
A product of inadequate ventilation which restricts the flow of air into an appliance. This may lower oxygen content in the surrounding air.


Indirect Wastes:
Waste pipe used to convey gray water by discharging it into a plumbing fixture such as a floor drain.


Induction Motor:
The most common type used in industry. Has a slippage of 2 to 5 percent compared to synchronous motors.


Influent:
The stream entering a unit, stream or process, such as the hard water entering an ion exchange water softener.


Injection:
The drawing of primary air into a gas burner by means of a flow of fuel gas.


Inlet:
An entrance, opening, or aperture for the intake of fluid or gas


In-line Pump:
Small pump which pumps fluid through a line on which it is supported and mounted.


Input:
The amount of fuel used by a water heater in a given period of time.


Input Rate:
The quantity of heat or fuel supplied to an appliance, expressed in volume of heat units per volume of time.


Input Rating:
the gas burning capacity of an appliance in BTU's per hour as specified by the manufacturer.


Insanitary:
So unclean as to be a likely cause of disease.


Inserts:
Faucet handles.


Insert Fittings:
Fittings equipped with external, annular rings for gripping, which are inserted into flexible rubber or plastic tubing as a connection.


Instantaneous Water Heater:
Type of water heater which heats supply as it passes through no storage tank necessary. Also known as a tankless heater.


Integral:
A cast or formed part of a fixture. such as a bubbler, trap ,seat, or tank.


Ion:
An atom or group of atoms which function as a unit, and have a positive or negative electrical charge, due to the gain or loss of one or more electrons.


Ion Exchange:
A reversible process in which ions are released from an insoluble permanent material in exchange for other ions in a surrounding solution; the direction of the exchange depends upon the affinities of the ion exchanger for the ions present, and the concentrations of the ions in the solution.


Ionization:
The process in which atoms gains or lose electrons; sometimes used as synonymous with dissociation, the separation of molecules into charged ions in solutions.


IPS:
Iron Pipe Size - Standard pipe threads. Female IPS is internal pipe threads, male IPS are external pipe threads. Also known as NPT or NPS.


Island Vent:
An air admittance valve.


ISO:
International Organization for Standardization based in Geneva Switzerland. Among the many standards is issues are pump and seal standards for the metric community.


Isolation Mount:
The four small rubber feet located beneath a whirlpool's pump base, or attached to the pulse canister assemblies, designed to reduce noise and vibration when the whirlpool is running.


Instantaneous Water Heater:
A type of water heater that heats water as it flows through a heat exchanger coil.


Insular:
Kohler's registered trade name for factory-installed insulation, which minimizes condensation on the outside of the tank when exposed to high humidity.


Integral Stops:
Stops that allow the owner to shut off water supply at the faucet for maintenance without shutting off the water supply to the entire house.


Integral Vacuum Breaker:
A device typically used in a sink or shower sprayer to keep water from backflowing into the fresh water supply.


Interceptor:
Device for separating grease and oil from drainage systems..


Isothermal:
Action that takes place with no change in temperature.


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