Laboratory fume hood function introduction

Laboratory ventilation is an integral part of laboratory design. In order to prevent laboratory workers from inhaling or ingesting some toxic, pathogenic or toxic chemicals and organisms, there should be good ventilation in the laboratory. To prevent the absorption of some vapors, gases and particulates (smoke, soot, dust and aerosols), the pollutants must be removed by means of a fume hood, hood or partial ventilation.

The fume hood is one of the most commonly used local exhaust devices in the laboratory. It has a wide variety of conditions. Due to its different structure and different conditions, the exhaust effect is different. The performance of the fume hood is good, depending on the speed at which the air moves through the fume hood.

Laboratory ventilation is an integral part of laboratory design. In order to prevent laboratory workers from inhaling or ingesting some toxic, pathogenic or toxic chemicals and organisms, there should be good ventilation in the laboratory. To prevent the absorption of some vapors, gases and particulates (smoke, soot, dust and aerosols), the pollutants must be removed by means of a fume hood, hood or partial ventilation.

The fume hood is one of the most commonly used local exhaust devices in the laboratory. It has a wide variety of conditions. Due to its different structure and different conditions, the exhaust effect is different. The performance of the fume hood is good, depending on the speed at which the air moves through the fume hood.

Laboratory fume hood function:

(1) Release function: The mechanism for absorbing the harmful gas generated inside the fume hood to absorb the gas outside the cabinet should be diluted to exclude the outdoor unit.

(2) Non-backflow function: It should have the function of the airflow generated by the exhaust fan inside the fume hood to prevent harmful gas from flowing into the room from the inside of the fume hood. In order to ensure the realization of this function, a single fume hood and a ventilator are connected by a single pipe. It is the best method. It cannot be connected by a single pipe. It is also limited to the same room in the same floor. Installed at the end of the pipe (or at the top of the floor).

(3) Isolation function: The inside of the fume hood should be separated by a non-sliding glass window.

(4) Supplementary function: There shall be a passage or alternative means for drawing in air from outside the fume hood when harmful gases are exhausted.

(5) Control wind speed function: In order to prevent the harmful gas in the fume hood from escaping, a certain suction speed is required. The factors that determine the suction speed of the air inlet of the fume hood are: the heat generated by the experimental content and the relationship with the number of air changes. The main ones are the experimental content and the nature of the harmful substances. Generally, the generally non-toxic pollutants are 0.25-0.38 m/s, the toxic or dangerous pollutants are 0.4-0.5 m/s, highly toxic or a small amount of radioactivity is 0.5-0.6 m/s, and the gas is 0.5m/s, granules are 1m/s. In order to ensure such a wind speed, the exhaust fan should have the necessary static pressure, that is, the frictional resistance of the air as it passes through the ventilation duct. When determining the wind speed, you must also pay attention to the noise problem. When the air flows through the pipeline, it is limited to 7-10m. If it exceeds 10m, noise will be generated. Generally, the noise limit of the laboratory (indoor background noise level) is 70dBA, and the pipe cut area will be increased. Reducing the wind speed also reduces noise. Considering the cost of the pipeline and construction problems, the power of the pipeline and the exhaust fan must be carefully selected.

(6) Heat-resistance and acid-alkali corrosion resistance: There are some electric furnaces in the fume hood, and some experiments produce a large amount of toxic and harmful gases such as acid and alkali, which are extremely corrosive. The countertops, linings, side panels and selected water nozzles and air nozzles of the fume hood should have anti-corrosion function. In the semiconductor industry or corrosive experiments using strong acid such as sulfuric acid, nitric acid, hydrofluoric acid, etc., the overall material of the fume hood must be acid and alkali resistant, and must be made of stainless steel or PVC material.

:

(1) Release function: The mechanism for absorbing the harmful gas generated inside the fume hood to absorb the gas outside the cabinet should be diluted to exclude the outdoor unit.

(2) Non-backflow function: It should have the function of the airflow generated by the exhaust fan inside the fume hood to prevent harmful gas from flowing into the room from the inside of the fume hood. In order to ensure the realization of this function, a single fume hood and a ventilator are connected by a single pipe. It is the best method. It cannot be connected by a single pipe. It is also limited to the same room in the same floor. Installed at the end of the pipe (or at the top of the floor).

(3) Isolation function: The inside of the fume hood should be separated by a non-sliding glass window.

(4) Supplementary functioDisposable Vape, Electronic Cigarettes, vapen: There shall be a passage or alternative means for drawing in air from outside the fume hood when harmful gases are exhausted.

(5) Control wind speed function: In order to prevent the harmful gas in the fume hood from escaping, a certain suction speed is required. The factors that determine the suction speed of the air inlet of the fume hood are: the heat generated by the experimental content and the relationship with the number of air changes. The main ones are the experimental content and the nature of the harmful substances. Generally, the generally non-toxic pollutants are 0.25-0.38 m/s, the toxic or dangerous pollutants are 0.4-0.5 m/s, highly toxic or a small amount of radioactivity is 0.5-0.6 m/s, and the gas is 0.5m/s, granules are 1m/s. In order to ensure such a wind speed, the exhaust fan should have the necessary static pressure, that is, the frictional resistance of the air as it passes through the ventilation duct. When determining the wind speed, you must also pay attention to the noise problem. When the air flows through the pipeline, it is limited to 7-10m. If it exceeds 10m, noise will be generated. Generally, the noise limit of the laboratory (indoor background noise level) is 70dBA, and the pipe cut area will be increased. Reducing the wind speed also reduces noise. Considering the cost of the pipeline and construction problems, the power of the pipeline and the exhaust fan must be carefully selected.

(6) Heat-resistance and acid-alkali corrosion resistance: There are some electric furnaces in the fume hood, and some experiments produce a large amount of toxic and harmful gases such as acid and alkali, which are extremely corrosive. The countertops, linings, side panels and selected water nozzles and air nozzles of the fume hood should have anti-corrosion function. In the semiconductor industry or corrosive experiments using strong acid such as sulfuric acid, nitric acid, hydrofluoric acid, etc., the overall material of the fume hood must be acid and alkali resistant, and must be made of stainless steel or PVC material.

Zhejiang Sujing Purification Equipment Co., Ltd. is located in Daoxu Town, Shangyu District, Shaoxing City, Zhejiang Province. It is a leading manufacturer in the purification equipment industry in East China. It can provide professional air purification system for microelectronics, biomedicine, hospital operating room, fiber optic cable, food and beverage, precision instrument, semiconductor and new material application industries according to ISO14644-1 standard, GB50073-2001 national standard and national GMP norm. Engineering design, construction, testing and technical services.

The company's main purification workbench series, air shower room series, fume hood series, biological safety cabinet series are widely used in medical and health, electronics, pharmaceutical, biological, food, agriculture, forestry, animal husbandry and veterinary, inspection and quarantine, aerospace, automobile manufacturing, Precision instruments, universities and research institutes enjoy a high reputation in the domestic and Southeast Asian markets.

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