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Does the air passing through an electrostatic filter (like Filtrete) Get ionized?

I've heard that ionized air can be potentially hazardous (eg free radicals) so I want to avoid air purifiers ionize the air. The 3M Filtrete polyolefins based on electrostatic filters (very common in furnace filters, and now part of a standalone air purifier) are pre-loaded with a static charge to attract dirt, dust and particles from the airflow. My question is, as air travel through the filter (via a fan) is there a way that it can collect any tax on the electrostatic filter, or air can become somewhat ionized in any way or form after leaving the filter? Now, as far as I know, the air does not cost much, so I would presume not, but I have an expert opinion.

The air can become somewhat ionized upon leaving the device However, the negative ions generated would be a small amount and would disapate in shallow exting unit.

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