Airfoil: Shape or steamline  member at hood entrance designed to enhance movement of air into hood

Air volume: Rate of airflow, normally express in cubic fit for minutes(CFM)

ASHRAE: American society of heating, Refrigerating and air conditioning Engineers, a professional organization that set industry standard for fume hood testing procedure.

Auxiliary Air: Supply or makeup air delivered external to the chamber of a fume hood to  reduce air consumption.

Baffle: Panels located across back of hood interior, which control pattern of air moving through the hood.

Blower: Air moving device(or fan) consisting a motor impeller, and scroll.

Bypass: Compensating opening that helps maintaining   constant volume exhaust from fume hood, regardless of  sash position.

Canopy Hood: Ceiling or wall suspended ventilating device for non critical use  heat, water, favor, odors, etc.

CFM: Cubit feet for minutes