Why do laminar flow hoods need to be equipped with flow-equalizing membranes?

    In modern scientific laboratories, laminar flow hoods are important purification equipment used to protect the reliable conduct of experiments and the safety of experimenters. In the design of laminar flow hoods, flow equalization membranes are widely equipped to ensure uniform distribution and flow of air in the hood. So, why do laminar flow hoods need to be equipped with flow-equalizing membranes?

    Laminar flow hoods enable the work area to meet Class A or local laminar flow requirements by providing unidirectional vertical airflow. To ensure the high cleanliness of the working area in the laminar flow hood to meet the process requirements, a polymer flow equalizing membrane is often installed, which is an important P accessory on the laminar flow hood.

1. First of all, the flow equalizing film can ensure the cleanliness of the experimental environment. There are various sources of pollution such as dust, particles, and microorganisms in the laboratory. These pollutants can interfere with or destroy experimental results. The flow equalizing membrane in the laminar flow hood can filter suspended particles and microorganisms in the air, ensuring the cleanliness of the experimental environment and providing suitable experimental conditions.

2. Secondly, the flow equalizing film can evenly distribute the air in the laminar flow hood. Because the temperature and humidity of the laboratory and the temperature of the experimenter are different, the air density will also be different. In a laminar flow hood without a flow equalizing membrane, the air will flow along the density gradient, resulting in inaccurate experimental results. By adjusting and evening the direction and speed of the airflow, the flow-equalizing membrane can eliminate these potential influencing factors and make the air evenly distributed within the hood, thereby improving the repeatability and accuracy of the experiment.

3. In addition, the flow equalizing membrane also helps control the gas flow in the laboratory. In some experiments, it is necessary to ensure that the gas flow in the experimental environment is orderly and controllable. The flow equalization membrane precisely controls the air circulation path and speed to form a uniform flow of gas in the laminar flow hood, preventing the airflow from being disturbed and interfering with the experimental results.

4. Finally, the flow equalizing film can also reduce turbulence and noise inside the laminar flow hood. Turbulence and noise often hurt the experimenter's productivity during experimental operations. The design of the flow-equalizing membrane can effectively reduce the occurrence of turbulence and noise, making the experimental operation more stable and quiet.

    To sum up, as an important part of the laminar flow hood, the flow equalization membrane can ensure the cleanliness of the experimental environment and the uniformity of airflow, control the gas flow, and reduce the occurrence of turbulence and noise. Therefore, a laminar flow hood equipped with a flow equalizing film can provide a good experimental environment, make the experimental results more accurate and reliable, and effectively ensure the safety of experimental personnel.