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  • Sensible Heat

    The amount of heat involved in raising or lowering the temperature of air, not including any heat required to cause water vapor to change state (e.g. from a gas to a liquid).
  • Sheathing

    Sheathing adds strength and wind resistance to house walls, and is now made in a variety of materials.
  • Spot Ventilation

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

    Insulation products that start out as a liquid, but end up as a solid.
  • Stack Effect

    The naturally occurring phenomena of warm air exerting pressure on cooler air that results in warm air rising.
  • Stale Air

    The air leaving a house through a ventilation system.
  • 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.
  • Supply Air

    The air entering a house through a ventilation system. Also, the conditioned air passing from a furnace/air conditioner into the living space.
  • Supply Grille

    A grille through which fresh air enters a room. See also Exhaust grille.
  • 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.
  • 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.
  • Terpene

    Terpenes are hydrocarbons - organic compounds made up of hydrogen and carbon - mainly from plants, and the main constituent of essential oils.
  • 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.
  • Total Solids (TS)

    Total solids are the weight of total dissolved solids (TDS), total suspended solids (TSS) and settleable solids per unit volume of water.
  • Total Suspended Solids (TSS)

    Total suspended solids, sometimes called filterable solids, are typically larger particles found in water that will not pass through a .45 µm pore-diameter filter.
  • Tracer Gas

    A gas, often inert, that is used to evaluate the air-exchange rate in a house.
  • Transfer Duct

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

    An opening between two rooms through which air can move when pressure imbalances occur between the rooms.
  • United States Environmental Protection Agency (USEPA)

    A federal agency charged with monitoring and regulating environmental quality, including air quality, and providing research-based information to the public.
  • UV-C

    UVC has been shown to inactivate viruses, mycoplasma, bacteria, and fungi, whether suspended in air or deposited on surfaces.

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