environmental consultants environmental consulting

Environmental Consultants

Phone: (800) 464-5285

IAQ Glossary


A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z

BACKGROUND CONCENTRATION: the level of a containment present before the introduction of a new store.

BACILLUS: A rod-shaped bacterium.

BACTERIOCIDAL: Able to kill bacteria

BACTERIA: Microscopic organisms living in soil, water, organic matter, or the bodies of plants and animals characterized by lack of a distinct nucleus and lack of ability to photosynthesize. Singular: Bacterium.

BACTERICIDE: Any agent that destroys bacteria.

BAKEOUT: a technique for reducing emissions of new construction materials and furnishings, in which the building temperature is raised (usually to at least 90 degrees F) for several days to enhance emissions of volatile compounds from new materials, while running the ventilation system at full capacity to exhaust the emissions.

BALANCING BY STATIC PRESSURE: Method of designing local exhaust system ducts by selecting the duct diameters that generate the static pressure to distribute airflow without dampers.

BAROMETER: Instrument for measuring atmospheric pressure.

BED DEPTH: the amount of adsorbent, expressed as units of length, parallel to the air stream, through which the air stream passes.

BENIGN: Not malignant. A benign tumor is one that does not metastasize or invade tissue. Benign tumors may still be lethal, due to pressure on vital organs.

BENZENE: A major organic intermediate and solvent derived from coal or petroleum. The simplest member of the aromatic series of hydrocarbons.

return to top

BERYL: A silicate of beryllium and aluminum.

BET METHOD: a method used to measure the surface area of granular activated carbon.

BETA PARTICLE (BETA RADIATION): A small electrically charged particle thrown off by many radioactive materials. It is identical with the electron. Beta particles emerge from radioactive material at high speeds.

BIOAEROSOL: An airborne organic contaminant that is either generated by or is itself a living organism; examples of bioaerosols are fungi, bacteria, viruses, protozoa, pollen, animal dander, insect emanations, microbial endotoxins, and human skin scales.

BIOEFFLUENT: any odorous volatile organic compound emitted by human beings, usually through perspiration or exhalation.

BIOHAZARD: A combination of the words biological hazard. Organisms or products of organisms that present a risk to humans.

BOILER: A closed container used to heat water or to make steam.

BREAKTHROUGH VOLUME: the sampling volume for which a significant amount (usually more than 1 %) of a VOC being drawn through a sorbent tube appears in the tube effluent, i.e., the volume that is sufficient for sampling but for which there will be no significant loss of analytes; also called retention volume.

BREATHING ZONE: the area of a room in which occupants breathe as the stand, sit and lie down, generally considered to be about 3-72 inches above the floor.

BRITISH THERMAL UNIT (BTU): The Btu is defined as the heat required to raise the temperature of one pound of water from one degree F.

return to top

BRONCHIAL TUBES: Branches or subdivisions of the trachea (windpipe). A bronchiole is a branch of bronchus, which is a branch of the windpipe.

BTU: British Thermal Unit - a measure of heat quantity.

BUILDING AIR INFILTRATION: the uncontrolled penetration of outside air into a building through cracks and seams, caused b the effects of wind or differences in indoor/outdoor air pressure.

BUILDING ENVELOPE: the outer walls, windows, doors, roof, and floors of a building: building shell

BUILDING-RELATED ILLNESS: a diagnosable illness with identifiable symptoms whose cause can be directly attributed to airborne pollutants within the building (e.g., Legionnaire’s disease, hypersensitivity pneumonitis)

BYPASS: A pipe or duct, usually controlled by valve or damper, for conveying a fluid around an element of a system.

return to top

Home | Residential | Commercial | Forensics | Well Building | Newsletter | Information Request | Glossary | Links | Contact Us
Copyright © 2011 Indoor Air Diagnostics. All rights reserved.