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  • Terpene

    Terpenes are hydrocarbons - organic compounds made up of hydrogen and carbon - mainly from plants, and the main constituent of essential oils.
  • Concrete

    Durable, versatile material made of four main ingredients: cement, aggregate, water, and admixtures.
  • Foundation

    Supports a house and transmits its load to the ground or soil. It can have a significant impact on the health and integrity of a home.
  • Masonry

    Building construction using materials such as concrete, tile and glass blocks, stone, brick and brick veneer.
  • Microwaves

    Microwaves are a form of electromagnetic radiation; that is, they are waves of electrical and magnetic energy moving together through space.
  • 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.
  • Return Air

    Air from a living space that enters an air handler, such as a furnace or air conditioner, and is returned back to the space.
  • Recirculate

    To move air through the living space without adding fresh air or removing stale air.
  • Convective Air Currents

    The movement of air resulting from heat transference through the air by convection.
  • Exhaust Air

    The air leaving a house through a ventilation system. See also supply air.
  • Air-Pressure Difference

    The dissimilarity in air pressures between two locations that can cause air to move between them.
  • Make-Up Air

    Outdoor air that enters a house to replace air that is exhausted from the house.
  • Stack Effect

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

    Brings fresh air in and takes stale air out, while conserving heat or cooling energy.
  • Ventilation Air

    Air that enters a house specifically for the purpose of ventilating. See also combustion air.
  • Air Changes per Hour (ACH)

    The number of times the volume of air in a house is replaced with outdoor air during an hour.
  • Particulate Filter

    An air filter designed to remove particulates from the air.
  • Fresh-Air Duct

    A duct through which air travels from the outdoors to the indoors to benefit the occupants, often integrated with a forced-air heating/cooling system.
  • Mechanical Ventilation

    The process of supplying air to, and removing air from, a house using a fan.
  • Central-Exhaust Ventilation

    A general-ventilation strategy that uses an exhaust fan to remove air from a house.

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