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  • MERV

    Stands for Minimum Efficiency Reporting Value.
  • Microbes

    The scientific name for what many people call germs or bugs. Microbes contribute to bad smelling bathrooms, but also function as natural cleaning agents.
  • Microwaves

    Microwaves are a form of electromagnetic radiation; that is, they are waves of electrical and magnetic energy moving together through space.
  • Mixed-Gas Sensor

    A device that senses oxidizable gases in the air and can be used to control a ventilation system.
  • MTBE

    MTBE (methyl tertiary-butyl ether) is a chemical compound that is manufactured by the chemical reaction of methanol and isobutylene. MTBE is produced in very large quantities (over 200,000 barrels per day in the U.S. in 1999) and is almost exclusively used as a fuel additive in motor gasoline.
  • Multiple Chemical Sensitivity (MCS)

    A medical condition involving hypersensitivities to a wide variety of common air and food contaminants at very low levels.
  • N95 respirator

    An essential tool used to protect people from hazardous fumes during certain jobs.
  • Nanotechnology

    Nanotechnology describes the creation and use of materials, devices and systems which control matter at the atomic or molecular level or “nanoscale”.
  • Natural Pressure

    An air-pressure difference between the indoors and the outdoors, induced by natural phenomena such as wind, stack effect, and diffusion.
  • Natural Ventilation

    Random air movement into and out of a house caused by natural pressures.
  • Negative Ions

    Negatively charged atoms or groups of atoms that will cling to oppositely charged surfaces.
  • Negative Pressure

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

    Air pressure inside a house that is equal to the atmospheric pressure outside the house.
  • Noise Pollution

    The traditional definition of noise is 'unwanted or disturbing sound'.
  • On-Purpose Ventilation

    Purposeful and directed air movement into and out of a building.
  • Ozone

    “Good up high, bad nearby,” according to one government agency. Here’s why.
  • 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.
  • Particle Board

    Made from small softwood particles that resemble coarse sawdust, and is usually held together with potent urea-formaldehyde (UF) glue.
  • Particulate Filter

    An air filter designed to remove particulates from the air.
  • Particulates

    Solid (or liquid) air pollutants, as opposed to gases.

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