CE Certified Low Face Velocity Energy Saving Chemical Fume Hood

Basic Info.

Packaging & Delivery

Product Description

A fume hood, technically a laboratory chemical hood, is a type of local exhaust ventilation system (engineering control). A typical fume hood is cabinet with a moveable front sash (window) made out of safety glass. Air is drawn into the hood under and through the opened sash and is exhausted through openings in the rear and top of the cabinet to a remote point such as an exhaust stack on the roof of the building.
A properly used and properly functioning fume hood exhausts hazardous gases, dusts, mists, and vapors from a confined location and helps protect workers from inhalation exposure.
A biological safety cabinet is similar to a fume hood in outward appearance but is designed for work with pathogens (infectious microorganisms) or materials contaminated with pathogens requiring a specific biosafety level.
Biosafety cabinets (BSC's) are designed to protect the user, the environment, and the material whereas fume hoods are designed to protect the user and others in that workspace. For example, a fume hood typically exhausts a toxic chemical to a roof stack where it is diluted to such a low concentration that it is unlikely to harm someone. In contrast, it would be a very bad idea to release a pathogen such as Ebola or virus to the environment, even if diluted, so biosafety cabinets are equipped with HEPA filters to remove the biological material. Biological safety cabinets may not be safe for use with toxic chemicals unless they exhaust the filtered air outside the lab/work space. There has been at least one report of an explosion caused by the use of flammable chemicals in a BSC.

1. Check to be sure the hood has been inspected within the last 12 months.

How a Fume Hood Works

A fume hood is a ventilated enclosure in which gases, vapors and fumes are captured and removed from the work area. An exhaust fan situated on the top of the laboratory building pulls air and airborne contaminants through connected ductwork and exhausts them to the atmosphere.

Depending on its design, the sash may move vertically, horizontally or a combination of the two and provides some protection to the hood user by acting as a barrier between the worker and the experiment.

The slots and baffles within the hood direct the air and, in many hoods, can be adjusted to allow the most even flow. It is important to prevent the baffles from becoming blocked, by excessive material storage or equipment, since this significantly affects the exhaust path within the hood and as a result, the efficiency of hood capture.

The beveled frame around the hood face, called the airfoil, allows for even air flow into the hood by eliminating sharp curves to reduce turbulence.