As with any electric appliance, the Friedrich Electronic Air cleaner does produce small amounts of ozone. During standardized industry testing at a Nationally Recognized Testing Labratory (NRTL), the highest ozone level measured was .014 parts per million (PPM). By comparison, the maximum allowable indoor concentration recommended by the FDA (Food and Drug Administration), ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) and UL is .050 PPM. Under normal conditions, ozone is very reactive to most surfaces and will convert rapidly to oxygen.

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