The difference between FFU and laminar flow hoods

FFU

The full English name is (Fan Filter Unit), and the professional Chinese term is "Fan Filter Unit (Unit)". The FFU can be modularly connected and used. The FFU is widely applied in clean rooms, clean workstations, clean production lines, assembled clean rooms, and local 100-level applications.
The FFU is equipped with two levels of filtration nets: primary and high-efficiency. The fan sucks in air from the top of the FFU and passes it through the primary and high-efficiency filters for filtration. The filtered clean air is uniformly and steadily discharged at a wind speed of 0.45M/S ± 20% throughout the entire outflow surface. It is suitable for obtaining high-level clean environments in various environments. It provides high-quality clean air for clean rooms of different sizes and different cleanliness levels, micro-environments. In new clean rooms, clean factory renovations, and refurbishments, it can increase cleanliness levels, reduce noise and vibration, and also significantly reduce costs. Installation and maintenance are convenient, making it an ideal component for clean environments. Large-scale use provides a clean environment, mostly used for 100-level or higher levels. Generally, the floor form is a raised floor, with return air ducts, and the surrounding area of this level must also ensure a lower-level cleanliness. The cost is relatively high.

Layered flow hood

The layered flow hood is an air purification device that can provide a local high-cleanliness environment. It is mainly composed of a box, fan, primary air filter, damping layer, lamps, etc. The outer shell is spray-painted. This product can be hung or supported on the ground, with a compact structure and convenient use. It can be used alone or connected in series to form a strip-shaped clean area. The layered flow hood uses the air to pass through the high-efficiency filter at a certain wind speed to form a uniform flow layer, ensuring that the clean air in the working area flows vertically and in a single direction, thus ensuring that the working area reaches the required high cleanliness. The clean layered flow hood has two installation methods: internal fan installation and external fan connection. There are hanging type and floor-standing bracket type. The layered flow hood uses the air to pass through the fan at a certain pressure and then through the high-efficiency air filter by the damping layer to equalize the pressure, sending the clean air in a vertical laminar flow type airflow into the working area. Thus, it ensures that the working area reaches the required high cleanliness. Compared with clean rooms, layered flow hoods have the advantages of lower investment, faster effect, lower requirements for factory foundation construction, convenient installation, and energy saving.
Currently, they are widely used in precision machinery, electronics, pharmaceuticals, food, fine chemicals, etc. The structure is more complex than FFU and is a local purification device. The requirements for the usage environment conditions are relatively low, used to provide a relatively high cleanliness level, suitable for renovation projects, and overall requirements are not very high. It is only a project that meets local requirements. It can be used alone or be connected in parallel on a large scale.