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  • ERV

    Energy recovery ventilators (ERVs) are heat recovery ventilators (HRVs) that exchange moisture between the two air streams.
  • Negative Pressure

    When the air pressure inside a house or room is less than the atmospheric pressure outside the house or room.
  • Secondary Ventilation

    Ventilation for the quick removal of air pollutants from near a source. See also local-exhaust ventilation.
  • Controlled Pressure

    An air-pressure difference between the indoors and the outdoors, purposefully induced by ventilation equipment.
  • Dew Point

    The temperature at which air is saturated with moisture (100% relative humidity), below which condensation will occur.
  • Positive Pressure

    When the air pressure inside a house or room is greater than the atmospheric pressure outside the house or room.
  • Pressurization

    When the air pressure inside a house or room is greater than the atmospheric pressure outside the house or room.
  • Wind

    A naturally occurring phenomenon that can cause a house to experience positive or negative air-pressure differences.
  • Random Holes

    The miscellaneous cracks, gaps, and openings in a house between the indoors and the outdoors through which air can move.
  • Energy-Recovery Ventilator (ERV)

    A balanced ventilation device that transfers both heat and humidity between the exhaust and supply air streams.
  • Transfer Duct

    A short duct connecting two rooms through which air can move when pressure imbalances occur between the rooms.
  • Deliberate Holes

    Openings (inlets or outlets) that are purposely placed in a house through which air can enter or leave.
  • Latent Heat

    The amount of heat that must be removed from air to change the water vapor from a gas to a liquid without changing its temperature.
  • Static Pressure

    The amount of pressure exerted against the walls of a duct or airway, created by the friction and impact of air as it moves.
  • Enthalpy

    The total amount of heat contained in air, the sum of the sensible heat and the latent heat.
  • Air-to-Air Heat Exchanger (AAHX)

    A balanced ventilation device capable of transferring heat (and sometimes moisture) between two airstreams.
  • Jump Duct

    A short duct connecting two rooms through which air can move when pressure imbalances occur between the rooms.
  • Permeable Wall

    An insulated part of a house’s structure through which outdoor air can pass from the outdoors to the indoors and is tempered in the process.
  • Multiple Chemical Sensitivity (MCS)

    A medical condition involving hypersensitivities to a wide variety of common air and food contaminants at very low levels.
  • Balanced Ventilation

    A general ventilation strategy that results in the house experiencing a neutral pressure.

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