Difference between FFU air filter and laminar flow hood

The difference between FFU and laminar flow hood is as follows: the English full name is fan filter unit, and the Chinese professional term is fan filter unit FFU can be used in modular connection FFU is widely used in clean room, clean bench, clean production line, assembly type clean room, local Grade 100 and other applications FFU is equipped with primary and secondary filter screens The fan draws in the air from the top of the FFU and filters it through the primary filter The filtered clean air is sent out at a uniform speed of 0.45M / s ± 20% on the whole air outlet surface It is suitable for obtaining other clean environment in various environments It provides high quality clean air for clean rooms and microenvironment of different sizes and cleanliness levels In the renovation of new clean room and clean workshop, the cleanliness level can be improved, noise and vibration can be reduced, cost can be greatly reduced, installation and maintenance are convenient, and it is an ideal part of clean environment Large area use provides a clean environment, which is mostly used for class 100 or more Generally, it requires that the floor form is an elevated floor, with a return air duct, and the surrounding of this level should also ensure a lower level of cleanliness The cost is high Laminar flow hood is a kind of air purification equipment which can provide local high clean environment It is mainly composed of box body, fan, primary air filter, damping layer, lamp, etc., and the shell is sprayed with plastic The product can be hung and supported on the ground, with compact structure and convenient use It can be used alone or connected to form a clean belt area The laminar flow hood is to pass the air through the filter at a certain wind speed to form a uniform flow layer, which makes the clean air flow vertically and unidirectionally, so as to ensure the cleanliness of the working area to meet the process requirements There are two kinds of clean laminar flow hoods, one is installed inside the fan and the other is connected outside the fan There are two kinds of installation methods: suspension type and floor bracket type After the air passes through the air filter with a certain wind pressure through the fan, the pressure is equalized by the damping layer The clean air is sent into the work area in a vertical laminar flow, so as to ensure that the work area reaches the high cleanliness required by the process 　　 Compared with the clean room, the laminar flow hood has the advantages of low investment, quick effect, low requirements for the civil engineering of the plant, convenient installation and power saving At present, it is widely used in precision machinery, electronics, pharmaceutical, food, fine chemical and other departments Its structure is more complex than FFU, and the requirements for the local purification equipment are relatively low, and it is used to provide local high cleanliness, which is suitable for the reconstruction project , and the overall requirements are not very high, just meet the local requirements of the project It can be used alone or in large area in parallel