SEFA – Types of Ventilated Devices
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 |
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