China Lab Ventilation System PP Fume Hood with Factory Price

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.
2. Read the Safety Data Sheets for materials being used in a hood. Note the physical, chemical, and toxicological properties of materials being used before hand.
3. Turn on the light for proper illumination.
4. Keep the hood clear of clutter and unused materials. Do not use a hood for long term storage. Storage reduces air flow and compromises hood capture efficiency.
5. All work should be done at least six inches from the front of the hood.
6. When large equipment is used, place on blocks to allow for a two inch air flow gap under the equipment.
7. Always lower the sash when not working in the hood.
8. Never place your head in the hood while an experiment is on going.
9. Avoid quick movements while working or passing in front of the hood. Rapid movements may cause turbulence or a backwash resulting in hazardous vapor escape.
10. Campus Facilities Maintenance can adjust the baffle according to the nature of the work:
11. Fume hoods are not to be used for disposal of unwanted material. The cap of the unwanted materials bottle must seal the container.
12. Hoods designated for radioactive material use need to be approved by Radiation Safety before use.
13. Use of perchloric acid must be in a properly operating Perchloric Acid Hood with water wash capabilities.

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.