Fume Hood

Fume hoods are essential safety equipment in laboratories, primarily used for exhausting indoor pollutants. They are commonly used lab devices in situations where hazardous gases need to be vented and during experiments that require cleaning and waste disposal.
The main function of a fume hood: The primary function of a fume hood is exhaust. In a chemical laboratory, during experiments, harmful gases, odors, and flammable, explosive, or corrosive substances may be produced. To ensure the safety of users and prevent the spread of contaminants from experiments into the lab, fume hoods are used near the source of pollution. In the past, fume hoods were used less frequently, only in experiments involving harmful and dangerous gases or those that generate large amounts of heat. The fume hood solely serves as an auxiliary function to the lab table.
The purpose of using a fume hood is to exhaust harmful gases produced during experiments, thus protecting the health of the experimenters. This means that the fume hood must offer high safety and operability, which requires it to possess the following functions:
Release Function: The unit should be equipped with a mechanism to dilute harmful gases generated inside the fume hood by absorbing external air from outside the cabinet, before releasing them outdoors.
Non-backflow function: The function should ensure that the air flow generated by the exhaust fan in the fume hood does not reverse flow back into the room. To achieve this function, it is preferable to connect a fume hood with a ventilation fan using a single pipe. For those that cannot be connected with a single pipe, they should only be connected within the same room on the same floor. The ventilation fan should be installed as close to the end of the pipe (or at the top of the floor) as possible.
Isolation Feature: A non-sliding glass window should be installed in front of the fume hood to separate the interior and exterior of the fume hood.
Additional Function: Must have a channel or alternative device to draw air from outside the fume hood when exhausting harmful gases.
Controlled Wind Speed Function: An intake speed is required to prevent harmful gases from escaping.
Thermal and acid-base corrosion resistance: Some fume hoods require electric furnaces, and certain experiments generate large amounts of acidic and alkaline harmful gases with strong corrosive properties. The countertops, linings, side panels, and selected water and gas nozzles of the fume hood should all have corrosion-resistant properties.