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The cleanroom laminar flow hood LAF is composed of fan, HEPA filter, plenum, shell, pre-filter, damping layer and other components, which is a local vertical unidirectional flow purification equipment, because the unidirectional flow gas organization is called laminar flow in the past, so it is called laminar flow hood. Laminar flow hoods are divided into two kinds with fan and without fan, with fan noise is larger, suitable for construction and renovation projects with low floors. The noise without fan is low, but the external fan is required, and the building height is higher, which is suitable for new construction projects. The laminar flow hood without a fan is actually a special HEPA filter outlet.
From the point of view of the air flow organization, the laminar flow hood can have an air curtain or can not have an air curtain. From the use point of view, it can be used as a local purification equipment or as a part of the tunnel clean room. Some production processes only require a small area of air cleanliness to reach class 5, there is no need to design the cleanliness of the entire workshop to level 5. This requirement can be achieved by using laminar flow covers, which can not only meet the process requirements, but also reduce the initial investment and operating costs of the project. For example, the penicillin distribution line of the pharmaceutical factory has adopted this scheme.
The modular clean room can be divided into prefabricated clean room, mobile clean room and clean toilet. The prefabricated clean room can be regarded as a large purification equipment, which is suitable for some places that urgently need a clean environment or require high local air cleanliness, such as bacteria control rooms and assembled wards used in hospitals. There are a variety of enclosure structures, such as steel plate wall structure, aluminum profile frame structure, non-metal and plastic veneer plywood wall structure, transparent film enclosure structure.
Its basic structure is designed according to a certain modulus, prefabricated in the factory, assembled and installed in the field of use. The assembled clean room is generally not equipped with an air conditioning cold source, but it can also be made into a structural form with an air conditioning cold source. The prefabricated clean room is mainly used for renovation projects and clean users who are not allowed to work on site for a long time.
The mobile clean room is generally composed of a laminar flow hood and a transparent film, which is characterized by mobility. For some precision assembly workshops, certain processes require a clean environment, and mobile clean rooms can be used to meet the requirements. Clean bathroom is a small clean room with sanitation facilities to solve the problem of going to the bathroom for staff in the clean area and clean ward staff. In the clean bathroom, the air flow is parallel, and the exhaust air is provided to maintain the internal negative pressure of 5~10Pa, and the pollution will not escape. In the bathroom is equipped with UV lamp, elbow switch wash basin, hand dryer, fan, exhaust fan, high efficiency filter and so on. As an overall equipment, it is installed in place during the construction of the clean room, and can be used when the water supply and drainage are connected, which is very convenient.
