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Working Principle: The fan sucks the ordinary air from the top, and the air enters the H-E-P-A filter through the air duct. The filtered air is sent out in a vertical direction. Ensure that the operation area reaches 100-level cleanliness. The fan is always running to maintain a dust-free environment in the desktop area. Application: Wide usage in dust-free room, edible mushrooms, laboratory and phone laminating machine operation and so on. The shipment will be arranged in 1-3 working days( not including customized product), and takes about another 3-9 working days to reach you.