A fume hood is a type of ventilation system that is designed to prevent exposure to hazardous or toxic fumes, gases, vapors, and dust. It consists of a box-like enclosure that is typically made of steel or other resistant materials, with a front opening that allows the user to access the interior. The enclosure is connected to a ventilation system that pulls air through the opening and exhausts it outside or filters it before recirculating it. Fume hoods are commonly used in laboratories, manufacturing plants, and other industrial settings where hazardous materials are handled. They are designed to protect the user from inhalation and skin exposure to toxic substances and to prevent contamination of the work environment. Fume hoods can also be used to control the release of noxious odors, smoke, and other emissions. It comes in different sizes and configurations to suit various applications. Some models have a built-in blower to exhaust air, while others are connected to a central exhaust system. Some fume hoods have adjustable sashes to control the amount of airflow, while others have fixed sashes. Fume hoods can also be equipped with filters to remove certain types of contaminants from the air, such as particulate matter or chemical vapors.

In summary, fume hoods are essential tools for maintaining a safe and healthy work environment when handling hazardous materials. They provide an effective means of controlling exposure to toxic substances and are an important part of any comprehensive industrial hygiene program.