- Air Volume:
- Rate of airflow, normally expressed in cubic feet per minute (CFM).
- ASHRAE:
- American Society of Heating, Refrigerating, and Air Conditioning Engineers, a professional organization that sets industry standards for fume hood testing procedures.
- Auxiliary Air:
- Supply or makeup air delivered external to the chamber of a fume hood to reduce air consumption.
- Blower:
- Air moving device (or fan) consisting of motor, impeller, and scroll.
- CFM:
- Cubic Feet Per Minute, a unit of measurement of air volume.
- Containment:
- Extent to which fumes are confined within the hood compartment.
- Damper:
- Device installed in duct to control air volume.
- Exhaust Volume/Parameters:
- Quantity of air exhausted by the fume hood; quantity of air required to maintain desired face velocity, expressed in cubic feet per minute (CFM).
- Face Velocity:
- Speed of air moving into the fume hood through the face opening, measured in feet per minute (FPM).
- FPM:
- Feet per minute; measurement of air velocity.
- Negative Pressure:
- Pressures lower than one atmosphere.
- Positive Pressure:
- Pressures higher than one atmosphere.
- Static Pressure:
- Air pressure, or resistance, in fume hood or duct, expressed in inches of water.
- Variable Air Volume (VAV):
- Type of fume hood exhaust system that typically maintains constant fume hood face velocity by adjusting blower motor speed or a balance damper in response to changes in sash position.
- Velocity:
- Speed of air, measured in feet per minute (FPM).
- Velocity Pressure:
- Force per square inch applied by moving air.
- Volume:
- Quantity of air, usually measured in cubic feet per minute (CFM).
- Work Surface:
- Top material; area in fume hood where apparatus rests and where work takes place.
