germguardian Guardian Technologies FLT41002PK FLT4100 HEPA Replacement Filter E for AC4100, AC4100CA AC4150BL, AC4150PCA, 2 pack, Black Air Purifier

Easily went into my air purifier, even though it had a yellow color on the band on outside my original one did not. Really thats about all you need. A filter just has to do its job once installed.

I had my air filter for about 8 months. I have been using it 24/7 more frequently because I now live with a cat and am allergic. As you can see it works very well. I noticed when it needed to be changed when I started sneezing and was congested. Once I replaced it, I slept amazing that night with no congestion in the morning! It lasts a long time and is SO easy to replace. A very reasonable price for how long it lasts. I will update when I replace this current one to give a more accurate length when using it 24/7.

This filter is the same as the one the unit came with. It is very easy to install and is working great.

This filter definitely works. From dust, dander, smoke, particles in the air etc. There is no match for this unit. I would recommend a different unit if you are using this for your sleep schedule; near your bed. This is not the most quiet machine ever but it is not super loud. Right in the middle. I would consider this unit to be a Post Malone of the air scrubber world.

Work well

this is an air cleaner filter. it seems to work fine.

Great product. Used to replace filters on the air cleaner I bought that doesnt make there filters any more...) :

Purchased this E style replacement filter pack for our Germ Guardian AC4100 (the little one that looks more like a speaker). Have had the air purifier for just about a year, but officially only has about 5 months of use on it. Both filters were quite dirty, so figured it was time to replace them. As far as I can tell, this was the genuine filter set for our purifier. Visually the same as the old filters (minus all the nasty filth), and fit into the purifier exactly the same. Have had the new filters in for half a day and can notice a positive change in the smell in the room, and the purifier seems to be running just a little quieter. Old filters may have had a little restriction, or I may just be imagining things.

I have such bad allergies. I love that my machine is about 4 yrs old and I can still easily find new filters here on Amazon!

Works great