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Glossary of Laboratory TermsAcid Storage Cabinet: cabinet with corrosion resistant liner for storing acids and other corrosive materials – usually vented into fume hood. Air Foil: curved or angular member at front of hood designed to reduce air turbulence. Air Volume: quantity of air normally expressed in cubic feet per minute (cfm). Auxiliary Air: Air delivered directly to fume hood to reduce room air consumption – sometimes called supply or supplemental air. Auxiliary Air Tempering Assembly: device for warming auxiliary air during cold weather. usually electrically heated. Auxiliary Work Shelf: optional working surface for a walk=in and distillation hood which is set. approximately 36” above room floor. Baffle: panel or panels located at rear of the hood interior which aid in directing the flow of air into and through the hood. Bench Hood: hood which rests on a countertop approximately 36” above room floor. Blower: air moving device consisting of a motor, impeller and housing – also called a fan. Bypass: a compensating opening that provides an alternate route for air to enter the hood as the sash is closed. This allows the exhaust volume to remain constant regardless of sash position and limits maximum velocity of air as sash is closed. Bypass Hood: hood which contains a bypass and, usually, air foils – also called a constant volume hood. Canopy Hood: an exhaust hood suspended over source of contaminants used to control heat, water vapor, odors and other non-hazardous materials. CFM: cubic feet per minute – unit of air volume measurement. Combination Sash: a vertical rising sash frame that has panels which slide in the horizontal direction – also called a type “A” sash. Constant Face Velocity Hood: hood which is equipped with a device that controls the hood exhaust volume so that a constant face velocity is maintained as the sash opens and closes. Constant Volume Hood: hood which contains a bypass and thus has the same exhaust volume regardless of sash position – also called a bypass hood. Damper: device installed in duct to control air volume. can either be pneumatically, electrically, or manually operated. Duct: round, square, or rectangular tube used to enclose moving air. Duct Collar: connection between duct and hood through which air passes. Duct Velocity: speed of air moving in duct (measured in FPM). Face: front opening of hood through which the user works gains access to hood interior. Face Velocity: speed of air moving into fume hood at face opening usually expressed in FPM. Facia (Fascia): vertical air foil at each side of sash opening on which the electrical receptacles, light switches and remote control fixture handles are mounted. Fan: air moving device consisting of a motor impeller and housing – sometimes called a blower. Fume hood: a ventilated, enclosed work space, with an open front, intended to capture, contain, and exhaust airborne contaminants generated within it – also called a laboratory hood. Gravity Sash Stop: device which limits the sash from being raised above the set point in normal operation, but which can be disengaged to allow greater access during set-up work. Hood Static Pressure: hood, usually expressed in units of inches of water. Laboratory Hood: a ventilated, enclosed work space with an open front – intended to capture, contain, and exhaust airborne contaminants generated within it, also called a fume hood. Liner: interior surfaces of fume hood which are directly exposed to contaminants. Magnehelic: the type of gauge suitable for measuring very low air pressures. Make-up Air: free or available air needed to permit fume hood to develop face velocity. Perchloric Acid Hood: hood designed for work with perchloric acid. Fabricated of Type 316 stainless steel with crack-free joints and coved corners. Pitot Tube: device for measuring velocity of air in a duct. Pre-plumbed: hood manufacturer installs and provides plumbing form fixture to plumbing chase. Pre-wired: hood manufacturer wires all hood electrical receptacles and switches to a common junction box, usually on top of hood. Radioisotope Hood: hood with crack-free joints and coved corners, designed for work with radioactive chemicals. Sash: movable panel set in hood face, usually transparent and can be either vertical rising or horizontal sliding. Sash Enclosure: device used to enclose vertical rising sash when it is in the up position and prevents air room flowing in to the hood behind the sash. Scrubber: device for removing contaminants from an air stream by “washing” air with water or some other neutralizing agent. Service Fitting: item of laboratory plumbing mounted on or fastened to laboratory furniture or fume hood, intended to control the supply of piped gases and liquids. Slot: narrow, long opening n baffle; height of opening can either be fixed or adjustable. Slot Velocity: speed of air moving through fume hood baffle openings. Solvent Storage Cabinet: provides protection for flammable materials stores inside in case of fire in the laboratory. Static Pressure: air pressure exerted perpendicular to the direction of the flow, usually expressed in units of inches of water gauge (in WG). Supplemental (supply) Air: air delivered directly to fume hood to reduce room air consumption – also called auxiliary air. Variable Air Volume: type of fume hood that utilizes controller to maintain constant face velocity (but variable volume0 by adjusting blower motor speed or balance damper in response to changes in sash position. Velocity: speed of air, measured in feet per minute. Walk-in Hood: floor-mounted, full height hood designed to accommodate tall apparatus and permit roll-in of instruments and equipment. Washdown System: water spray system used primarily in perchloric acid hood applications. Spray nozzles are incorporated in hood, ducting and blowers to rinse all contaminants from exhaust system.
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