Transportation and installation of filters for laminar flow cabinet

The filter of the purification workbench should be implemented according to the requirements during transportation, installation, and use to ensure the effectiveness of use. After the use of various filters, dust is captured on the surface of the filter material, which reduces the speed and resistance of the filter and affects the cleanliness of the air supply. At this time, it is necessary to modify the filter as soon as possible.
For filters that need to be used in high humidity and high temperature backgrounds, it is necessary to select filter paper that is resistant to high temperature and high humidity, as well as intermediate partition boards and frame materials, to meet the production requirements. A clean room for living materials and a clean room for medical drugs must use a metal frame filter, and its surface is either prone to rust. It is not allowed to use a wooden frame filter to prevent the growth of bacteria and affect the product's compliance rate.
For the above filters, if there is a differential pressure gauge or differential pressure sensor before and after the filter, it is necessary to modify the coarse efficiency filter when the pressure difference is greater than 250Pa; For medium efficiency filters, when the pressure difference is greater than 330Pa, it is necessary to modify it; For sub filters, when the pressure difference is greater than 400Pa, they must be modified and the original filter cannot be reused; For filters, when the resistance value of the filter is greater than 450Pa; Or when the airflow speed on the outlet surface drops to the end limit, even after changing the coarse and medium efficiency filters, the airflow speed cannot be increased; When the surface of the filter shows any leakage that cannot be repaired, a new filter must be replaced; If there are no conditions mentioned above, it can be changed once every 1-2 years based on the background conditions of the application.
In order to fully utilize the effectiveness of the filter, during the selection and application process, the frontal wind speed of the filter should not exceed 2.5m/s for coarse and medium efficiency filters, and 1.5m/s for sub filters and filters. This not only helps to ensure the speed of the filter, but also extends the service life of the filter and saves costs. During the operation of the facility, do not change the filter; If the filter cannot be shut down for modification due to reaching the deadline for modification, only the coarse and medium efficiency filters can be modified while the fan is in operation; The sub filter and filter must be replaced only after the air supply is stopped; The tight sealing gasket between the filter and the signature frame must be tight and leak free to ensure the effectiveness of the purification workbench.