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I've purchased other off brand filter elements for my Blueair HEPA filter system before but these filters have only about half the folded pleats compared to the filter elements I removed. That means only half the filter surface area which means less initial air flow and a shorter life span. I would avoid buying these.
Verified purchase: Yes | Condition: New
Filters work well. Came brand new and were a perfect fit for my 501.
Verified purchase: Yes | Condition: New
More than 1/2 the price of blue air filters .... works just as well & made in USA .. will purchase again
Verified purchase: Yes | Condition: New
I fully recommend these.
Verified purchase: Yes | Condition: New
If you measure with a fine dust meter, you can see that it is a really good filter. It is a good product.
Verified purchase: Yes | Condition: New