Laboratory fume hoods are perhaps the most widely used ventilated device. 

However, the family of ventilated devices includes, in addition to the fume hoods, biosafety cabinets, laminar flow hoods, local exhaust ventilation and more.

All ventilated devices used in a laboratory are safety devices and should be carefully examined

for application and safe working practice. 

Let’s look at the SEFA classification of the ventilated devices.

Type Sub-Category Remarks
Laboratory Fume Hoods
Bench Top Hood Hazard: Chemical 

Toxicity: Low to High 

Volume Generation: Small to Large

Effluent: Gases, Vapors, Mists, Fumes, etc

Distillation Hood
Floor Mounted Hood
Auxiliary Air Hood
Radioisotope Hood
Perchloric Acid Hood Hazard: Perchloric Acid only 

Volume Generation: Small to Moderate

Effluent: Gases, Vapors, Mists

Other Ventilated Laboratory Safety Devices
Demonstration Hood
California Hood
Ventilated Enclosure Oversized 

Table Top 

Conventional 

Balance 

Microscope 

Robotic 

Tissue Trimming

Local Exhaust Ventilation
Canopy Hood Hazard: Chemical 

Toxicity: None to Low 

Volume Generation: Small 

Effluent: Gases, Vapors, Particulate, Powder

* Must be specifically designed for process

Slot Hood
Snorkel Elephant Trunk
Laminar Flow Hoods
Class I Weighing Enclosure Hazard: Chemical 

Toxicity: Low to High 

Volume Generation: Small to Large

Effluent: Particles

Biological Safety Cabinets
Class I Cabinets
Class II Type A1 Cabinets Hazard: Biological 

Toxicity: Low to High 

Volume Generation: Small 

Effluent: Particulate, Powder

Class II Type A2 Cabinets
Class II Type B1 Cabinets
Class II Type B2 Cabinets

Total Exhaust

Limited use with Gases, Vapors, and Radionuclides
Glove Box Safety Cabinets
Class III Glove Box Hazard: Chemical, Biological, Radiological 

Toxicity: Immediately Dangerous to Life

and Health (IDLH)

Volume Generation: Small 

Effluent: Gases, Vapors Particulate, Powder

* Do not use for volatile process

Ductless Fume Hood
Ductless Fume Hood Hazard: Chemical 

Toxicity: None to Low 

Volume Generation: Small 

Effluent: Gases, Vapor, Particulate, Powder

Kewaunee, the global leader in total laboratory solutions, empowers organisations to achieve competitive advantage through safe, efficient, and contemporary laboratories. In existence since 1906, Kewaunee powers the laboratories for over 5,000 customers in more than 100 countries.

Comments are closed.