In my opinion these particular ones that one bought are rejects. one have bought these filters before and the baking soda was covered on one side of the filter. This time only half of the one side of the filters on most importantly ternion boxes are covered with baking soda. ace believe that that should have been stated when purchasing. ace really like the hourly set shut off so ace can run it for an hour after he leaves for work to clear the air.Dont overlook these Carbon Pre-Filters. Im not really happy with this purchase.EvelynSince iodine replaced my Kenmore old unit, my house no longer smells like my husbands cigarette smoke.
They truly extend the life of the hepa filters, and also can be cut to fit for other types of filter devices.
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