Good, great allergy filtration, great price and made in the USA! Who could ask for more! They get dirty quickly and have to be replaced frequently. We live in the South East and there is an incredible amount of pollen and dust in the air. They really do their job. Change them often to keep your fan heater alive because they catch everything! They really help with our allergies. We have 2 units with 3 cold air returns and use them all. Did I mention they are made in the USA! Switch to Nordic Pure and stop buying more expensive and less effective products!
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