I bought two 4-packs in 12 x 30 x 1 because my size seems odd enough for Home Depot, refrain from storing it. Just today, 10 months later, I installed the fifth of these filters. I live alone in a 1,300 square foot house but I travel a lot. I bought them because dust and pollen are a nuisance so I decided to run a fan on my air conditioner all the time to combat them. but I've had absolutely no recurrence of allergy-related misery this year, despite removing a thick sheen of green pollen from my car a month ago. I still have to dust my house, but not as often. When the filter is completely clogged you will almost hear your air system whistling and you will see the filter pull slightly in the direction of the airflow.
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