Ratings & Reviews for Alen B4-Fresh + Carbon HEPA Air Purifier Filter

“Auto”and large capacity make this perfect for us.

I traded up from a smaller one and now I can run this one on “auto” and it runs at a super low decibel rating, without forfeiting air quality. It does speed up when there is any smoke or “smells” coming from the kitchen, though, which is two rooms away. I trust it and feel it’s worth the investment. We have it in a room where we often chat or watch tv, and both have some hearing loss, so with its ability to run so quietly it's a win-win!

Assured of quality

We have relied upon Alen to provide us with filter air quality for several years. We like the auto-renewal feature so we do not foget to replace our filter each year.

The scheduled filter replacement arrangement

The scheduled filter replacement arrangement was very easy. A notice was given before the order was processed and arrived on time. The filter was really easy to install.

Your filtration system with the

Your filtration system with the HEPA and odor cartridges is the only thing that minimizes the odor from my recently inherited cats! The only problem is that they love playing with the machine, hitting the buttons and turning the machine off! I need to rig up a rigid plastic cover so they can't turn it off!

Good product.

Good product. I wish the filter would work a bit more to remove food/cooking smell.

It’s amazing how much it

It’s amazing how much it picks up. Recommend to vacuum frequently for best filtration

Clean Air

Love it. Not only does it take out much of the dust and smoke, it also removes odors. Amazing how quickly the unit detects odors, like from cooking.

Best air purifier

Absolutely love my alen air purifiers. The Replacement filter comes right on time. I run mine 24/7 , very quiet on low to medium.

We regularly change our pre-filters

We regularly change our pre-filters and filter on our Allen BreatheSmart FLEX and having recurring shipments of theses filters takes one thing off my to do list!

Great air filter, for an

Great air filter, for an old poorly sealed house it keeps our dust issues at bay.

Just installed both the 75

Just installed both the 75 and 45 filters. Looking forward to annual replacements

45i HEPA Filters

I've been an owner of two 45i units for over a year now and with the HEPA filters have operated flawlessly.