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  • Combustion Air

    Air that enters a house specifically to be used in the combustion of a fuel.
  • Dilution

    The mixing of fresh air into stale air to reduce the concentration of pollutants; also applies to liquids.
  • Exhaust Ventilation

    A general-ventilation strategy that uses an exhaust fan to remove air from a house. An equal volume of make-up air enters either by way of through-the-wall vents, through a fresh-air duct connected to a forced-air heating/cooling system, or through random holes in the structure of the house.
  • Demand-Controlled Ventilation (DCV)

    The process of automatically supplying air to, and removing air from, a house whenever needed by the occupants.
  • Air Filter Efficiency

    Describes the ability of an air filter to remove very fine particles of solid or liquid found in the air, such as aerosols, smoke, fumes, dust and ash.
  • Supply-Only Ventilation

    A general ventilation strategy that uses either a supply ventilation fan or a forced-air heating/cooling fan to draw air into a house.
  • Circulating Air

    Air that moves from room to room or throughout a house.
  • Central-Supply Ventilation

    A general ventilation strategy that uses either a supply ventilation fan or a forced-air heating/cooling fan to draw air into a house.
  • Partial-Bypass Filter

    A filter that removes some contaminants from the air, but allows some air to pass through without contacting the filter, usually to minimize the resistance to airflow.
  • Stale Air

    The air leaving a house through a ventilation system.
  • Accidental Ventilation

    Random air movement into and out of a house.
  • Controlled Ventilation

    Purposeful air movement into and out of a building in a regular way.
  • Fresh Air

    Outdoor air that is brought indoors.
  • Relative Humidity (RH)

    The amount of moisture in air compared to the maximum amount of moisture that air at that temperature can contain, usually expressed as a percentage.
  • Through-the-Wall Vent

    A deliberate opening in an exterior wall through which air moves. The direction of air movement can be inward or outward, depending on the pressure difference between the indoors and the outdoors.
  • Supply Ventilation

    A general ventilation strategy that uses either a supply ventilation fan or a forced-air heating/cooling fan to draw air into a house.
  • Combustion-Air Duct

    A duct through which combustion air travels from the outdoors to a combustion device.
  • Exhaust-Only Ventilation

    Ventilation strategy that uses one or more fans to exhaust stale air that is replaced by outdoor air entering through passive inlets and/or random leaks. See central-exhaust ventilation.
  • Air distribution

    Movement of air throughout a house with a ventilation system or heating/cooling system.
  • Dilution Air

    Air that mixes with combustion by-products prior to their being expelled from a house through a natural-draft chimney.

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