Fume hood chemistry

A fume hood, also called a chemical fume hood, is essential safety equipment in laboratories handling volatile, toxic, or hazardous substances.

About this subject

A fume hood is a local ventilation device that protects the operator and the laboratory environment from inhaling hazardous chemical vapors, gases, and dusts. Its operating principle relies on drawing contaminated air through a front opening, which is then filtered or exhausted outside. Various types exist, such as ducted fume hoods and recirculating hoods with activated carbon filters, each suited for specific applications.

Proper use of a fume hood is critical to avoid exposure to carcinogenic, corrosive, or flammable agents. International standards, such as ANSI/ASHRAE 110, set performance requirements to ensure containment effectiveness. Beyond safety, fume hoods also contribute to experiment quality by minimizing cross-contamination. Regular maintenance, including airflow checks and filter replacements, is essential for their proper operation.

Frequently Asked Questions

What is the difference between a chemical fume hood and a biosafety cabinet?

Fume hoods are designed for chemical vapors, while biosafety cabinets protect against biological agents, using HEPA filters to sterilize exhausted air.

How can I tell if a fume hood is working properly?

Check airflow with an anemometer and perform smoke tests to ensure adequate containment. Regular maintenance and calibration are essential.

Can I use a fume hood for storage of chemicals?

No. Fume hoods should only be used during manipulation of hazardous substances, not as storage cabinets, as they can accumulate vapors and create risks.