Fume Hood

Laboratory Bench Ventilation Cabinet

Fume hoods are essential safety equipment in laboratories, primarily used for expelling indoor exhaust gases. They are commonly used laboratory equipment in situations where hazardous gases need to be vented and for cleaning and waste disposal during experiments.
The primary function of a fume hood: The main function of a fume hood is exhaust, particularly in chemical laboratories where harmful gases, odors, and flammable, explosive, or corrosive substances are produced during experiments. To ensure user safety and prevent the spread of pollutants from experiments into the lab, fume hoods are used near the source of contamination. Historically, fume hoods were used sparingly, only in experiments involving harmful and dangerous gases or those that generate large amounts of heat. The fume hood primarily serves as an auxiliary function to the lab table.
The purpose of using a fume hood is to expel harmful gases produced during experiments, safeguarding the health of laboratory personnel. This necessitates a high level of safety and operability, requiring the fume hood to possess the following functions:
Release Function: The system should be equipped with an institution that dilutes harmful gases generated in the fume hood by absorbing external air from the cabinet and then discharges them outdoors.
Non-backflow feature: The function should ensure that the airflow generated by the exhaust fan within the fume hood does not reverse and flow back into the room. To achieve this function, it is preferable to connect a single fume hood with a single exhaust fan using a single pipeline. For those that cannot be connected using a single pipeline, they should only be connected in the same room on the same floor. The exhaust fan should be installed as close to the end of the pipeline (or at the top of the floor) as possible.
Isolation Feature: The fume hood should be equipped with a non-sliding glass viewport in front to separate the interior and exterior of the hood.
Supplementary Feature: Must have a channel or alternative device to draw in air from outside the fume hood when releasing harmful gases.
Wind speed control function: An intake speed is required to prevent harmful gases from escaping.
Thermal and corrosion-resistant properties: Some fume hoods require the installation of electric furnaces, and some experiments produce a large amount of corrosive acidic and alkaline gases. The countertop, lining, side panels, and selected water nozzles, gas nozzles, etc., of the fume hood should all have corrosion-resistant functions.