FYI.  There have been reports that the so-called electronic air cleaners that emit "negative ions" damage rubber products in short order.  For example a pinch roller on a 6 mo old VCR that aged 20 years or a one-month-old drive belt that was crumbling.  Other reports are of rapidly failing rubber seals windows and disintegrating carpet pads. What was in common with all these reports were various models of negative-ion air cleaners that had been recently installed.  It seems that the ions penetrate every crevice and will attack rubber.

Denny  AE6C

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