A fume hood is a ventilated enclosure used in laboratories to safely handle hazardous substances. It works by drawing air into the hood and exhausting it outside, protecting users from harmful fumes, vapors, and dust. Fume hoods are essential for experiments involving toxic chemicals, ensuring a safer working environment. These devices come in various designs, including ducted and ductless models. A ducted fume hood expels air outside, while a ductless hood filters and recirculates air back into the lab. Proper use and maintenance of a fume hood are crucial for laboratory safety and compliance with health regulations.