Alen Air Filter BF35-VOC/Smoke Replacement HEPA Filter for BreatheSmart Classic Air Purifier - Captures Allergens & Mold + VOCs & Smoke (1 Filter)

These are not cheap. But you should have researched that before buying an Alen air purifier right? We LOVE our Alen and have had one since 2015. I am currently using this in a room where I 3D print using plastics like PETG and ABS. ABS is known to release benzene and some other VOCs, so a natural choice for me to remove this threat was to purchase Alen's VOC filter since we already had the purifier. The extra charcoal added to this filter makes it perfect for filtering VOCs which is not something to take lightly. This filter not only filters VOCs, but also filters tons of junk that usually causes my wife to have asthma attacks every few days. She has not had to use her inhaler much since we purchased an Alen, and even less since purchasing this filter.

Have now gone through a few of these and can't spot any issues. They last almost exactly 6 months. Key is to open and vacuum the dust and hair off the outer foam from time to time to extend the efficiency of the filter. We live in the city close to a main road, so this purifier is working non-stop. Would be nice if the prices on these filters came down a bit, but it's generally reasonable for the quality and time it lasts. I have not noticed any toxic smells from any units I've used.

I know it’s spendy but so worth it. I replace this every 6 months and it is a life saver. Gets rid of the neighbors cigarette smoke which trails into my house and which I am allergic to. This filter keeps the air clean for me....it works. Love it!

I can't really tell the difference between one filter or the other. For me, they all work great. I do notice that my allergies are better with a new filter, however I can't honestly say on is better than another, I just can't tell the difference. I wish you could buy pre filters for it, that’s the only downfall of the filters.

good filter

Replaced the original filter that came with this unit after three months. We have three cats and with repeated washing of the outer filter ,it was not functioning as well as at first.Can they be purchases separately? I vacuumed them both regularly (twice weekly) and it still showed "red" often. Hoping this will alleviate the dust/dander . Other than all is working fantastic.

This has made a difference for me and my family. Problems with my sinuses have cleared up and my son's room doesn't get filled with dust like it use to. My son able to breathe and sleep better at night.

works great

My neighbour smokes A LOT, and the smoke seeps into the house. Other replacement brands are not able to handle it—when I smell the air coming out of the machine using cheaper aftermarket filters, it still smells very strongly of cigarettes. With this VOC filter, the only thing that comes out is a fresh breeze.Learn my lesson and buy only the OG replacement filters. Well worth the price.