The main function of the fume hood is to control the harmful chemical gas produced in the cabinet to prevent its leakage, and to discharge it as soon as possible to protect the safety of the staff in the laboratory. When enabled fume hood, the operator stood in front of the fume hood, stretched out his hand into the fume hood interior experiment operation, the airflow will be formed at the operator side rotating airflow, causing gas contained in the overflow, even the body along the operators to the breathing zone. The larger the inlet wind speed, the stronger the rotation flow.

In a relatively ideal operating environment, if the fume hood airflow inhibition performance very well, so imports of wind speed in 0.3 0.41 m/s can assure enough airflow suppressed, but inhibit performance will fluctuate in this scope, need to develop effective laboratory practice, and strictly implemented. Fume hood imports of wind speed in 0.41 to 0.51 m/s, air inhibition performance also can produce fluctuations, but the wind speed is suitable for most of the fume hood low risk operation, suitable for most laboratory chemistry experiment, still should strictly carry out effective laboratory practice. The effect of the air flow suppression in the range of 0.51-0.61 m/s was similar to that of 0.41-0.51 m/s, but the operating costs were significantly improved. The inlet wind speed of the fume hood can be controlled by high efficient air flow in the range of 0.61-0.76 m/s, but the effect is not improved substantially, and the energy consumption will obviously improve.

In order to ensure that there is no turbulence in the ventilation cabinet and the gas in the fume hood, the inlet wind speed of the fume hood should be kept within the proper range of 0.3-0.5 m/s. When used commonly, the inlet wind speed is selected between 0.4-0.5 m/s. If the outside world have an adverse effect for fume hood airflow inhibition or experimental drug toxicity is higher, while imports of wind speed of 0.5 to 0.5 m/s, if imports of wind speed close to or more than 0.75 m/s, be a turbulent flow in the ventilation cabinet, reduce airflow inhibition efficiency.

Because of various factors that can influence on the imports of wind speed, for example: the indoor lab for confession and vent inlet wind speed wind wind will influence each other, so any import wind sweeping standards will lose the reference value. The high inlet wind speed is wasted energy, but it will not improve, it will worsen the air flow suppression effect of the fume cupboard. Lower imports of wind speed can make the operator and other equipment items in the laboratory games significantly influence the performance of security of the fume hood, and fume hood can significantly reduce the airflow inside ark inhibition capacity, resulting in a corresponding risk, therefore, if in the fume hood position and number of indoor ventilation requirements are satisfied, on the basis of import wind speed is greater than 0.3 m/s best advice, 0.4 0.6 m/s is appropriate, in the gas contained in the cabinet can be better controlled.

To meet the requirements of use, and ensure the safety of the laboratory personnel to exhaust fan rotational speed and the fume hood exhaust valve control to adjust the fume hood exhaust air control device should be reasonable design, the minimum air output should take 50 ft CFM/ft * (the width) of the fume hood or 25 CFM/ft2 * ft2 (fume hood area), if the fume hood to stop using or have a written description in addition there are other requirements, then choose the appropriate minimum exhaust air according to the requirements. The main function of the fume hood is to control the harmful chemical gas produced in the cabinet to prevent its leakage, and to discharge it as soon as possible to protect the safety of the staff in the laboratory. When enabled fume hood, the operator stood in front of the fume hood, stretched out his hand into the fume hood interior experiment operation, the airflow will be formed at the operator side rotating airflow, causing gas contained in the overflow, even the body along the operators to the breathing zone. The larger the inlet wind speed, the stronger the rotation flow.

In a relatively ideal operating environment, if the fume hood airflow inhibition performance very well, so imports of wind speed in 0.3 0.41 m/s can assure enough airflow suppressed, but inhibit performance will fluctuate in this scope, need to develop effective laboratory practice, and strictly implemented. Fume hood imports of wind speed in 0.41 to 0.51 m/s, air inhibition performance also can produce fluctuations, but the wind speed is suitable for most of the fume hood low risk operation, suitable for most laboratory chemistry experiment, still should strictly carry out effective laboratory practice. The effect of the air flow suppression in the range of 0.51-0.61 m/s was similar to that of 0.41-0.51 m/s, but the operating costs were significantly improved. The inlet wind speed of the fume hood can be controlled by high efficient air flow in the range of 0.61-0.76 m/s, but the effect is not improved substantially, and the energy consumption will obviously improve.

In order to ensure that there is no turbulence in the ventilation cabinet and the gas in the fume hood, the inlet wind speed of the fume hood should be kept within the proper range of 0.3-0.5 m/s. When used commonly, the inlet wind speed is selected between 0.4-0.5 m/s. If the outside world have an adverse effect for fume hood airflow inhibition or experimental drug toxicity is higher, while imports of wind speed of 0.5 to 0.5 m/s, if imports of wind speed close to or more than 0.75 m/s, be a turbulent flow in the ventilation cabinet, reduce airflow inhibition efficiency.

Because of various factors that can influence on the imports of wind speed, for example: the indoor lab for confession and vent inlet wind speed wind wind will influence each other, so any import wind sweeping standards will lose the reference value. The high inlet wind speed is wasted energy, but it will not improve, it will worsen the air flow suppression effect of the fume cupboard. Lower imports of wind speed can make the operator and other equipment items in the laboratory games significantly influence the performance of security of the fume hood, and fume hood can significantly reduce the airflow inside ark inhibition capacity, resulting in a corresponding risk, therefore, if in the fume hood position and number of indoor ventilation requirements are satisfied, on the basis of import wind speed is greater than 0.3 m/s best advice, 0.4 0.6 m/s is appropriate, in the gas contained in the cabinet can be better controlled.

To meet the requirements of use, and ensure the safety of the laboratory personnel to exhaust fan rotational speed and the fume hood exhaust valve control to adjust the fume hood exhaust air control device should be reasonable design, the minimum air output should take 50 ft CFM/ft * (the width) of the fume hood or 25 CFM/ft2 * ft2 (fume hood area), if the fume hood to stop using or have a written description in addition there are other requirements, then choose the appropriate minimum exhaust air according to the requirements. The main function of the fume hood is to control the harmful chemical gas produced in the cabinet to prevent its leakage, and to discharge it as soon as possible to protect the safety of the staff in the laboratory. When enabled fume hood, the operator stood in front of the fume hood, stretched out his hand into the fume hood interior experiment operation, the airflow will be formed at the operator side rotating airflow, causing gas contained in the overflow, even the body along the operators to the breathing zone. The larger the inlet wind speed, the stronger the rotation flow.

In a relatively ideal operating environment, if the fume hood airflow inhibition performance very well, so imports of wind speed in 0.3 0.41 m/s can assure enough airflow suppressed, but inhibit performance will fluctuate in this scope, need to develop effective laboratory practice, and strictly implemented. Fume hood imports of wind speed in 0.41 to 0.51 m/s, air inhibition performance also can produce fluctuations, but the wind speed is suitable for most of the fume hood low risk operation, suitable for most laboratory chemistry experiment, still should strictly carry out effective laboratory practice. The effect of the air flow suppression in the range of 0.51-0.61 m/s was similar to that of 0.41-0.51 m/s, but the operating costs were significantly improved. The inlet wind speed of the fume hood can be controlled by high efficient air flow in the range of 0.61-0.76 m/s, but the effect is not improved substantially, and the energy consumption will obviously improve.

In order to ensure that there is no turbulence in the ventilation cabinet and the gas in the fume hood, the inlet wind speed of the fume hood should be kept within the proper range of 0.3-0.5 m/s. When used commonly, the inlet wind speed is selected between 0.4-0.5 m/s. If the outside world have an adverse effect for fume hood airflow inhibition or experimental drug toxicity is higher, while imports of wind speed of 0.5 to 0.5 m/s, if imports of wind speed close to or more than 0.75 m/s, be a turbulent flow in the ventilation cabinet, reduce airflow inhibition efficiency.

Because of various factors that can influence on the imports of wind speed, for example: the indoor lab for confession and vent inlet wind speed wind wind will influence each other, so any import wind sweeping standards will lose the reference value. The high inlet wind speed is wasted energy, but it will not improve, it will worsen the air flow suppression effect of the fume cupboard. Lower imports of wind speed can make the operator and other equipment items in the laboratory games significantly influence the performance of security of the fume hood, and fume hood can significantly reduce the airflow inside ark inhibition capacity, resulting in a corresponding risk, therefore, if in the fume hood position and number of indoor ventilation requirements are satisfied, on the basis of import wind speed is greater than 0.3 m/s best advice, 0.4 0.6 m/s is appropriate, in the gas contained in the cabinet can be better controlled.

To meet the requirements of use, and ensure the safety of the laboratory personnel to exhaust fan rotational speed and the fume hood exhaust valve control to adjust the fume hood exhaust air control device should be reasonable design, the minimum air output should take 50 ft CFM/ft * (the width) of the fume hood or 25 CFM/ft2 * ft2 (fume hood area), if the fume hood to stop using or have a written description in addition there are other requirements, then choose the appropriate minimum exhaust air according to the requirements.