Problems that should be paid attention to when using fan filter (FFU)

Fan filter (FFU) is a tail air purification device that combines the fan with high efficiency filter or ultra-high efficiency filter to provide driving force. It consists of fan, filter, housing and electrical control. The main technical performance of FFU includes air volume (generally expressed in section wind speed), residual pressure, energy consumption, efficiency, noise and control methods.

At present, more and more FFUs are used in electronic industry cleanrooms in our country, not only in large-scale, but also in unidirectional flow or mixed flow cleanrooms, which have strict air cleanliness requirements and are used for various purposes. Clean rooms with small areas are also selected.

FFU is a high efficiency filter air supply outlet with fan (caseless fan). It has its special keel system and pressure fan Cooling coil The fresh air system and special lamps together form the FFU system. That is to say, fans and filters (high efficiency filter or super filter

High efficiency filters) are combined to form their own tail purification equipment, which can provide power. In the past, the air outlet of the high efficiency fan filter and the laminar flow hood of the self purifier were commonly used in purification engineering. Attention shall be paid to the following issues during selection and installation:

1. Noise control

Generally speaking, FFUs are used in parallel with several or even dozens of fans. The noise superposition shall be considered in the design to ensure that the 50073-2001 "The noise level (empty state) of non unidirectional flow clean rooms shall not be greater than 60dB, and the noise level of unidirectional flow and mixed clean rooms shall not be greater than 65dB" is clearly stipulated in the design code GB for clean room plants. Therefore, when selecting fans, it is better to select high-performance, press out type and axial blade fans for direct drive to reduce the overall noise.

2. Select the fan housing

When selecting the fan housing structure, it is not only necessary to consider preventing the fan leakage, removing the damage caused during transportation and transportation, but also to consider the disinfection environment. Therefore, it is better to choose stainless steel or aluminum alloy as the shell.