To provide a fan assembly minimizing accumulation of contamination such as dust on a working air fan an extending lifetime of the fan assembly.

A shaft supported by a bearing is driven by the motor assembly. The shaft penetrates the bracket and extends into a shroud assembly. A first fan is connected to the shaft and is provided in a first chamber. A second fan is connected to the shaft and is provided in a second chamber. Air is made flow through the fan assembly by rotation of the first and the second fan by the shaft. Dust is almost prevented from adhering on blades of the first and the second fan during operation. Consequently, crushing and accumulation of uneven dust generating excessive vibration and reducing lifetimes of the bearing and a brush can be prevented.

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