Multi-Layer Solid Wood Duct Chemical Fume Hood Corrosion Resistant

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.

Type of Fume Hoood

Student workstations
Student workstations are generally deployed in undergraduate teaching lab
settings and are used by students while under supervision by instructor. Accordingly, materials of construction are adjusted to suit less demanding chemical resistance needs. Glass side and back windows are often provided. Often these hoods are placed on an island and are manufactured in a back-toback configuration with two working chambers.

Acid Digestion Hoods
- For operations involving heating and evaporation of acids, special materials are used in the construction of the hood interior. The principle changes include a PVC or polypropylene liner, polytetrafluoroethylene (PTFE) coated sash frame, lower airfoil and exhaust connection. In addition, if the hood will be used with hydroflouric acid, then the sash glass and light lens is changed from glass to polycarbonate.

Perchloric Acid Hoods
For operations involving heating and evaporation of perchloric acid, special fume hoods are produced. These hoods are always bench top models with the addition of a wash-down system and drain trough to remove hazardous perchlorate residues from the hood interior. Perchloric acid hoods are always connected to a dedicated exhaust system which is also equipped with a water wash system. Perchloric acid hoods can be equipped with a stainless steel liner if they will be used with perchloric acid only or a PVC liner if they will be used with other acids as well.

2. Product Parameters 

3. More About the Fume Hood 

Fume hoods and other exhaust devices are the single largest energy consumer in a typical laboratory. It is therefore essential to explore options to minimize the energy consumption. When seeking to lower the energy consumption of fume hoods there are, broadly speaking, three approaches.

-Reduce the size of the working sash opening while maintaining a conventional face velocity of 80 - 100 feet /minute
-Reduce the face velocity to 50 - 60 feet/minute while maintaining a generous working opening.
-Implement usage based controls such as VAV so that energy consumption is minimized while the fume hood is not in use.

We supports all these options with our product range which includes restricted bypass hoods for VAV use, High Efficiency hoods that operate at 50-60 feet/minute and the Low Volume model which features a reduced size working opening. We also offers auto lowering sashes in both spring return and motorized versions.

Fume Hood Sash Types

We provides fume hoods with a variety of sash configurations. The most common type for bench hoods is the vertically rising sash. This sash travels up and down only and generally provides maximum protection for the operators face when it is used approximately half open. The combination sash is essentially a vertically rising sash frame with smaller inset horizontally sliding panels. In general this should be reserved for operations that require frequent access to the upper portion of the fume hood chamber. Larger floor mount fume hoods can be provided with double hung vertically rising sashes or top hung horizontally sliding panels. Various combinations of the above sashes can be specifically designed to meet your exact needs.

Counter Top Materials
Counter tops can be provided for hoods in either stainless steel (note limitations in liner section) or cast epoxy resin. Epoxy is most commonly selected due to its very broad chemical resistance

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?