Honeywell HFR-11 Pure HEPA Permanent Replacement Filter

Correct air cleaner model numbers listed here
The "Features:" and "Product Discription" do not list the correct Honeywell air cleaner model numbers that use this filter. Here is the "Replacement Filter Table" on the box of the HRF-11. The first number is the Air Purifier series followed by the # of filters required in parenthesis. The last, right number is for the HEPA filter model # it replaces:

10500 (2) 20500
10590 (1) 20590
17000 (2) 20500
50100 (1) 20590

As another reviewer has already noted, this is not really a 'permanent' filter because it must be replaced every 3-5 years under normal use, just like the non-permanent filter that originally came with the air cleaner.

I'm giving it 4 stars for two reasons: 1. Because I really do not find a difference in the way this works yet compared to the filter that came with my 17000; and 2. My machine requires two of these so the air actually goes through less HEPA material than the one-piece filter that came with the machine [casing...

Good replacement but semi-permanent only
I have 2 Honeywell 50100 air purifiers and bought 2 of these as replacement HEPA filter for the originals. The HRF-11 is the new "permanent" replacement filter and is a good choice.

However, I rated this 4-star only despite fitting nicely in the 50100. The product's statement of "permanent" is misleading, though you can clean the filter twice a year with a vacum cleaner, the manual still recommends that you replace the filter every 3 to 5 years under normal usage.

I think KAZ (who licenses the Honeywell brand from Honeywell) is simply asking to be sued for labeling a product like this. I'll use the words "extended life" if I were them to avoid law suits.

Other than that, its a great product and is cheaper than those throw-away type filters.

Genuine Honeywell - You'll need two for a model 17000
These are genuine Honeywell filters even though they are actually manufactured by a medical products company "Kaz USA" that pays a license to use the Honeywell brand name.

If you own a Honeywell Model 17000, you'll need two of these filters. Similar to other reviews, I don't like how I now have to install and stack two filters. It's also harder to wrap the activated carbon pre-filter snugly around two of these filters. Once installed the cover is lopsided so I can only hope there is an airtight seal. I question whether it will perform as well as the original single filter system.

Depending on the model, you need to use one filter, stack two filters, and/or use the foam gasket that is included.

From the box:
Model 10500 (or HEPA filter 20500) uses two HRF-11 filters
Model 10590 (or HEPA filter 20590) uses one HRF-11 filter
Model 17000 (or HEPA filter 20500) uses two HRF-11 filters
Model 50100 (or HEPA filter 20590) uses one...

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