I don't know anything about "free radicals" but I can tell you that electronic air cleaners do work very well at removing dust and smoke from the air, most air cleaners installed in the air conditioning system are better installed at the time the furnace is installed. If the furnace is an upflow, the furnace sits on the air cleaner, to install one later you would need to remove the furnace, install the air cleaner and reinstall the furnace, if it has air then that would have to be raised up also. Much cheaper to do at time of original installation. Good luck, Mike
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