Manufacturers of the Air-Sentry Fume Hood


What is a Fume Hood?

A Laboratory Fume Hood is a ventilated enclosure designed to contain and exhaust fumes, vapors, mists and particulate matter generated within the hood interior. Fume hood structures are basically boxlike, with an open side (or sides) for access to the interior of the hood. A transparent, movable panel, called a sash, allows the user to restrict or enlarge the hood opening. The hood is connected, via ductwork, to an exhaust fan, usually located on the roof of the building in which the hood is located. The exhaust fan draws air from the room in which the hood is in through the hood opening and out through the ductwork. The speed of the air moving through the hood opening is known as face velocity.

Above all else, laboratory fume hoods are SAFETY DEVICES, designed to contain contaminants generated inside the fume hood’s chamber. Selection of the proper fume hood design and safe work practices are key to user safety.

Laboratory fume hoods are also referred to as:

• Fume Hoods
• Chemical Fume Hoods
• Fume Cupboards
• Exhaust Hoods
• Hoods

The following is the definition of a Laboratory Fume Hood from the Scientific Equipment and Furniture Association (SEFA):
"A Laboratory Fume Hood is a ventilated enclosure that, when connected to a properly designed laboratory ventilation system, will carry the undesirable effluents (generated within the enclosure during a laboratory procedure) away from laboratory personnel. A Laboratory Fume Hood shall be made primarily from the flame resistant materials including the top, three fixed sides, and a face opening. The face opening is equipped with a sash and sometimes an additional protective shield. The face opening will have a profiled entry and usually an airfoil designed to sweep and reduce reverse airflows on the lower surface. A Laboratory Fume Hood will be equipped with a baffle and, in most cases, bypass systems designed to control airflow patterns within the enclosure and manage the even distribution of air at the opening. The bypass system may be partially blocked to accommodate Variable Air Volume (VAV) Systems. A Laboratory Fume Hood will be set on a bench, a pedestal, or on the laboratory floor. Generally, Laboratory Fume Hoods, as long as twenty feet, reflect the basic tenant of a Laboratory Fume Hood." (Scientific Equipment and Furniture Association, SEFA 1-2002 Recommended Practices for Laboratory Fume Hoods. 2002.)


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