Fume Hood Technology - Glossary Airfoil: Shaped or streamlined member at hood entrance designed to enhance movement of air into the hood.
FPM: Feet per minute; measurement of air velocity.
Liner: Fume hood interior sides, back, and top, including baffle.
Air Volume: Rate of airflow, normally expressed in cubic feet per minute (CFM).
Lintel: Portion of fume hood front located above access opening
ASHRAE: American Society of Heating, Refrigerating, and Air Conditioning Engineers, a professional organization that sets industry standards for fume hood testing procedures.
Louvers: Slit-like openings in the lintel that allow bypass air to enter the hood when the sash is closed.
Auxiliary Air: Supply or makeup air delivered external to the chamber of a fume hood to reduce air consumption.
NFPA: National Fire Protection Association.
Negative Pressure: Pressures lower than one atmosphere.
Baffle: Panels located across back of hood interior, which control pattern of air moving through the hood.
Positive Pressure: Pressures higher than one atmosphere.
Blower: Air moving device (or fan) consisting of motor, impeller, and scroll.
Restricted Bypass Fume Hood: Fume hood operating type, designed with limited bypass area; commonly used in conjunction with Variable Air Volume (VAV) exhaust systems and restricted sash opening designs.
Bypass: Compensating opening that helps maintain constant volume exhaust from fume hood, regardless of sash position. Canopy Hood: Ceiling or wall suspended ventilating device for noncritical use with heat, water vapor, odors, etc. CFM: Cubic Feet Per Minute, a unit of measurement of air volume. Combination Sash: Horizontal panels in a vertically rising frame; see sash. Constant Volume: Type of fume hood exhaust system that exhausts the same volume of air, regardless of sash position. Containment: Extent to which fumes are confined within the hood compartment.
Sash: Sliding glass panel set in the fume hood face that provides access to the hood interior.
Service Fitting/Plumbing: Water faucets and gas valves mounted on or fastened to the fume hood.
Static Pressure: Air pressure, or resistance, in fume hood or duct, expressed in inches of water.
U.L. 1805: Underwriters Laboratories certification that verifies conformance to electrical, mechanical, and airflow standards. 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.
Damper: Device installed in duct to control air volume.
Velocity: Speed of air, measured in feet per minute (FPM).
Demonstration Hood: Fume hood with glass panels on two or three sides to improve visibility for demonstrating experiments in a classroom setting. 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 (through the sash), 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.
Air Master Systems Corp. • 231.798.1111 • airmastersystems.com
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