Fume hood chemistry

Chemical fume hood, essential equipment for laboratory protection against toxic gases and flammable vapors.

About this subject

A chemical fume hood is a ventilation device designed to limit exposure to hazardous substances in laboratories. It works by drawing contaminated air away from the operator, filtering or exhausting it outside. Fume hoods are common in chemistry, biology, and pharmacy labs, crucial for safety when handling acids, volatile solvents, or reactive materials. Typical airflow is 0.5 m/s at the opening, maintained by powerful motors. Modern models include flow sensors and alarms. The history dates back to the 19th century, with improvements during World War II. In Brazil, standards such as NBR 16526 regulate installation and performance. It is important never to block ventilation or store products inside the hood. Periodic maintenance is required, including leak checks and sensor calibration.

Frequently Asked Questions

What is the difference between a fume hood and a biological safety cabinet?

A fume hood protects the operator from chemical vapors, while a biological safety cabinet protects both the operator and the sample from biological contaminants. They have different airflow principles.

How to check if a fume hood is functioning properly?

Use an anemometer to measure the face velocity (standard: 0.5 m/s). Also check low-flow alarms and duct integrity.

Is it safe to use a fume hood for chemical storage?

No. The hood should not be used for storage because accumulation of flammable or toxic vapors can create fire or explosion risks. Use appropriate storage cabinets.