Laboratory Chemical Fume Hood Heat Resistant Explosion Proof

Acid & Alkali Resistant Fireproof Heat Resistant Explosion Proof Laboratory Chemical Fume Hood

1. Product Description 

A fume hood (sometimes called a fume cupboard or fume closet) is a type of local ventilation device that is designed to limit exposure to hazardous or toxic fumes, vapors or dusts.

A fume hood is typically a large piece of equipment enclosing five sides of a work area, the bottom of which is most commonly located at a standing work height.

Two main types exist, ducted and recirculating (ductless). The principle is the same for both types: air is drawn in from the front (open) side of the cabinet, and either expelled outside the building or made safe through filtration and fed back into the room. This is used to:

-protect the user from inhaling toxic gases (fume hoods, biosafety cabinets, glove boxes)
-protect the product or experiment (biosafety cabinets, glove boxes)
-protect the environment (recirculating fume hoods, certain biosafety cabinets, and any other type when fitted with appropriate filters in the exhaust airstream)

Secondary functions of these devices may include explosion protection, spill containment, and other functions necessary to the work being done within the device.

2. Product Parameters 

3. More About the Fume Hood 

Why Workplace Practices Matter

Before beginning work, one of the most important practices lab technicians should conduct is to ensure the exhaust fan is working. The exhaust system performs the main job of a hood, so if not working properly, the hood will not operate effectively.

To do so, they should check:

-The baffles, which are the movable partitions that create openings in the back of the hood. These keep airflow uniform, which increases efficiency.
-For any obstructions, to ensure airflow is not impeded.
-The airflow monitor, if part of the hood's design. Checking the status of the airflow monitor is important because the device will alert you if any suspected changes in airflow occur.

The following are some further examples of routine practices that should take place to ensure a fume hood operates efficiently and safely:

-Follow manufacturer's guidelines regarding the placement of apparatus. In general, all work should be conducted and all apparatus should be kept at least 6 inches back from the hood's face.
-Keep the fume hood's sash between you and the work you are conducting.
-Remove any obstructions from the hood slots and baffles to ensure good airflow remains.
-Follow proper laboratory design to reduce outside airflow influences, such as positioning the fume hood away from doors and minimizing foot traffic patterns.
-Do not store chemicals or lab equipment in the hood. If large equipment must be stored in the hood, place pieces on blocks to allow air to flow under the equipment.
-Avoid sources that may cause a spark inside the hood, including electrical receptacles.

4. Detailed Photos

5. Fume Hood Maintenance

• Hoods should be evaluated by the user before each use to ensure adequate face velocities and the absence of excessive turbulence.

• In case of exhaust system failure while using a hood, shut off all services and accessories and lower the sash completely. Leave the area immediately.

• Fume hoods should be certified, at least annually, to ensure they are operating safely. Typical tests include face velocity measurements, smoke tests and tracer gas containment. Tracer gas containment tests are especially crucial, as studies have shown that face velocity is not a good predictor of fume hood leakage.

• Laboratory fume hoods are one of the most important used and abused hazard control devices. We should understand that the combined use of safety glasses, protective gloves, laboratory smocks, good safety practices, and laboratory fume hoods are very important elements in protecting us from a potentially hazardous exposure.

• Laboratory fume hoods only protect users when they are used properly and are working correctly. A fume hood is designed to protect the user and room occupants from exposure to vapors, aerosols, toxic materials, odorous, and other harmful substances. A secondary purpose is to serve as a protective shield when working with potentially explosive or highly reactive materials. This is accomplished by lowering the hood sash.

6. Project Cases

7. FAQ

6 Questions to Ask When Buying a Fume Hood:

-Which chemicals will you use within the hood?

-Is a ducted or ductless hood best suited to your needs and available space?

-Where will you place the fume hood in the lab? Consider workflows, access to external exhaust systems, and competing air patterns.

-What size fume hood will best suit your needs? Be sure to consider what (if any) equipment will be enclosed in the hood.

-Are any service fixtures or accessories such as airflow monitors, electrical outlets, water, or gas fixtures required?

-Are base cabinets for acid, solvent, or non-chemical storage required?