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- An air-pressure difference between the indoors and the outdoors, induced by natural phenomena such as wind, stack effect, and diffusion.
- 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.
- The negative pressure in a chimney caused by rising, warm air and combustion by-products. Often referred to simply as draft.
- A method of testing medium-efficiency air filters.
- A form of carbon used as an adsorption or pollutant-reduction material in air or water filters, often derived from coconut, wood, or coal.
- An air filter that generates a high voltage which causes particulates to become electrically charged and cling to metal plates having an opposite charge.
- A balanced ventilation device capable of transferring heat between the exhaust and supply airstreams.
- The process of removing particles or pollutants from air or water.
- An air filter configured to have a large amount of surface area to minimize resistance to airflow. See also medium-efficiency filter.
- Another term you’ll see frequently. What do we mean?
- A ventilation system, usually an exhaust fan, used to move air through an entire house, usually in high volumes for the purpose of summer cooling.
- Caused by house pressurization or depressurization, not directly caused by a fan. Infiltration and exfiltration involve passive air movement.
- A plastic material that carries a permanent static charge, used in some air filters.
- An inert gas used to test high-efficiency (HEPA) particulate air filters.
- 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).
- A device that senses the carbon dioxide concentration in the air and can be used to control a ventilation system.
- Stands for High Efficiency Particulate Air filter, often used in hospitals and laboratories.
- A filter that relies on a fibrous material, usually polyester or fiberglass, to physically strain particulates out of the air.
- A medical condition involving hypersensitivities to a wide variety of common air and food contaminants at very low levels.
- A method of testing very low-efficiency air filters.
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