What are the tasks of the pre-filter and the main filter in the dust collectors?

A pre-filter is designed to filter coarse particles such as sand, fluff and hair, to allow the following main filter, which is responsible for filtering very small particles, to work efficiently for a longer period.

This system is called 2-stage filtration. But regardless of how many pre-filters the system has, the air quality after passing the main filter can only be as good as the previously installed main filter class.

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