A tube in which combustion gases from a combustion appliance are vented out of the appliance to the outdoors.

Any light source designed specifically to direct light a task or work performed by a person or machine.

A power line for supplying electricity within a specified area.

A light source composed of a metal base, a glass tube filled with an inert gas or a vapor, and base pins to attach to a fixture.

As defined in the Energy Security Act (P.L. 96-294; 1980) as "any organic matter, including sewage, sewage sludge, and industrial or commercial waste, and mixtures of such matter and inorganic refuse from any publicly or privately operated municipal waste ...

Gasoline fuel additives such as ethanol, ETBE, or MTBE that add extra oxygen to gasoline to reduce carbon monoxide pollution produced by vehicles.

A drag-type wind machine that can react to wind from any direction.

The pressure of the steam or water in a boiler as measured; usually expressed in pounds per square inch gauge (psig).

The unit of illuminance equivalent to 1lumen per square meter.

see Peak Power

A device mounted in the vent connector that closes the vent when the heating unit is not firing. This traps heat inside the heating system and house rather than letting it draft up and out the vent system.

The prescribed level of pollutants allowed in outside or indoor air as established by legislation.

A building energy auditing technique used to determine and/or locate air leaks in a building shell or envelope.

A facility or piece of equipment that produces electricity.

A charge for the maximum rate at which energy is used during peak hours of a billing period. That part of a utility service charged for on the basis of the possible demand as distinguished from the energy actually consumed.

The unit of magnetic field intensity equal to 1 dyne per unit pole.

A compound used to make certain types of solar photovoltaic cells.

The potential energy available in a fuel as received, taking into account the energy loss in evaporating and superheating the water in the fuel. Equal to the higher heating value minus 1050W where W is the weight of the water formed from the hydrogen in t ...

A unit of electrical capacitance; the capacitance of a capacitor between the plates of which there appears a difference of 1 Volt when it is charged by one coulomb of electricity.

The heat absorbed or released when a substance undergoes a change in temperature.