Although they can be a little pricey, buying in bulk will save you money. I've been using lower quality filters for a few years and only found them online when I was looking for them. I have to say that the thicker element doesn't seem to affect airflow to my heater and it's amazing how much more it noticeably picks up. I didn't believe it at first, but after going through a few of them and seeing what they catch, plus the air inhalation, I can safely say it's worth every penny. It seems to have helped my family with allergies.
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