FFU and laminar flow hood

Are FFU and laminar flow hood the same thing? Not many words, direct dry goods, first understand the summary of each:
FFU is equipped with primary and high-efficiency two-stage filters. The fan sucks in air from the top of the FFU and filters it through primary and high-efficiency filters. The filtered clean air is sent out at a uniform speed of 0.45M/S±20% on the entire air outlet surface. It is suitable for obtaining high-class clean environment in various environments. It provides high-quality clean air for clean rooms and micro-environments of different sizes and different cleanliness levels. In the new clean room, clean workshop-style renovation and renovation, the cleanliness level can be improved, noise and vibration can be reduced, the cost can also be greatly reduced, installation and maintenance are convenient, and it is an ideal component for a clean environment. Large-area use provides a clean environment, mostly used for class 100 or higher. Generally, the floor form is required to be raised floor with return air ducts, and the surrounding cleanliness of this level should also be guaranteed to be low and high. The cost is relatively high and the air return path is required to return the air to the ceiling.

Principle of FFU laminar air supply unit


Laminar flow hood is a kind of air purification equipment that can provide a local high clean environment. It is mainly composed of a box body, a fan, a primary air filter, a damping layer, a lamp, etc., and the shell is sprayed with plastic. The product can be hung and supported on the ground. It has a compact structure and is easy to use. It can be used singly or connected to form a belt-shaped clean area. The laminar flow hood forms a flow-sharing layer after passing the air through the high-efficiency filter at a certain wind speed, so that the clean air flows in a vertical and unidirectional manner, thereby ensuring the cleanliness required by the process in the working area. There are two types of clean laminar flow hoods, which are installed inside the fan and connected to the outside of the fan. There are two installation methods: suspension type and floor stand type. The clean air is fed into the work area in a vertical laminar flow pattern, thereby ensuring that the work area achieves the high cleanliness required by the process. Compared with clean rooms, laminar flow hoods have the advantages of low investment, quick results, low requirements for plant civil construction, convenient installation, and power saving. At present, they are widely used in precision machinery, electronics, pharmaceuticals, food, fine chemicals and other departments. FFU is complex, it is a partial purification equipment, and its use environmental conditions are relatively low. It is used to provide relatively high cleanliness in parts, suitable for renovation projects, and the overall requirements are not very high, but only projects that meet local requirements. It can be used alone or in parallel in a large area, and the indoor air return is sufficient.

FFU laminar flow air supply unit characteristics


The biggest difference between FFU and laminar flow hood is that the laminar flow hood returns air from the room, while the FFU must return air from the ceiling. Do you understand?