I disassembled one of these filters. The "paper" is actually a sheet of fiberglass which is hot-glued into the form. The actual size of the fiberglass sheet is about 28" x 9". I would recommend covering the outside of the filter with a sheet of paper towel to catch the ordinary dust and extend the life of the filter. Note that some Holmes aer1 filters are not True-HEPA so they cost slightly less. The True-HEPA is supposed to capture a higher percentage of the small particles (something like 99.97%) while the other HEPA-type is only 99%, but supposedly the air flow rate can affect the actual percentage.
Verified purchase: Yes | Condition: New
I purchased the fan about 4 years ago. I have only changed filters twice, which they are past due. This filter gets rid a lot bad stuffs in the air that cause allergies. I only use this for my sleep.
Verified purchase: Yes | Condition: New
Removes just about everything bad from the air. Great for breathing easier without allergens, dust, ,pollen and mold spores.
Verified purchase: Yes | Condition: New
Correct filter for my unit. Brand new. Thx
Verified purchase: Yes | Condition: New
I needed this replacement filter desperately. I was unable to find it in nearby stores. Thank goodness you came to the rescue. Cheers!
Verified purchase: Yes | Condition: New
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