Shaft and impeller imbalance. Straightened with plasticine inside the impeller bushing. It got a little better. The sharp leading edges of the impellers emit a hiss. Rolled up a little, the hiss was gone. But the blades are too soft for such power. They play and rumble. As a result, where you need to blow hard, color is useless, and rattling due to a noisy environment does not interfere, it will go. I don't recommend it for home use.
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