Breathe Naturally - Replacement Filters Compatible with Honeywell Air Purifier HPA300, HPA300 or HRF-R3 Series – Activated Carbon Prefilter – 12" x 17.2", 14" x 17.2" - Easy Replacement - (Pack of 4)

These fit my Honeywell 300 perfectly. I know these prefilters can be vacuumed but really, only so many times before they are just a dirty filter. The main filters last much longer. These were worth the purchase to have a good clean filter!

I recently purchased a new freidrich through the wall air conditioner. The replaceable filters from the company are something like $40+ dollars for 3 filters which are approximately 17" x 10". I ordered a 4 pack of these HPA300 filters for about $18. They are 17x14 and the same quality as the friedrich ones. I just trimmed it a little to fit the holder on the ac and they work great. Saved over $20.

I was hesitant at first, but now I'm so glad I got these. I've purchased other pre-filter replacements before, but I always ended up having to measure and cut them in order to fit perfectly in my Honeywell HPA300 Air Purifier (that, in addition to cleaning up the remains afterwards). With these - there is no cutting. They fit perfectly. All I have to do snug them into the four rectangular pre-filter placement holders and strap it in place, and I'm done. I have a pack of 4, which should last me for quite a while, but once they are finished, this will be the only pre-filter replacement I'll be using.

Is as described, but is thinner than the Honeywell brand. This is cheaper in how it is made. I don't know if that means it will not work as well. When I ordered, it was my first time replacing the filter my device cane with so I thought it was the same brand and I realized right away that it was more flimsy. I would buy it again if I could not afford the brand name when I needed more.

We recently purchased a Honeywell HPA300 True Hepa air purifier with a charcoal pre-filter. We really like it because it filters the air in our large bedroom five times an hour, reduce the dust, cat hairs, etc. The first night we used it I noticed that my wife was not coughing all night like she used to and neither was I. A wonderful addition to the bedroom for those with allergies. It is located in the corner near the windows. I feel the slight cool breeze from it and the noise doesn't bother us at all or interfere with our sleeping. A good investment!

These filters fit into my HP300 perfectly! No more trouble closing up my units!

PERFECT. JUST REMOVE OLD AND POP IN THE NEW. (I was expecting a hassle) However, I decided to see what would happen when I washed the dirty one. In kitchen sink using spray hose. Dirt came off easily and filter looked almost new. See photo. No damage to filter, just dirt came off🤩

I love fresh air and it’s as easy as pushing a button and install a fresh filter once in a while. The filter lasts very long and I even once tried to wash it off with clear water so I could use it even longer. And the good thing is, it worked and I saved some money while doing so.