Two BreatheSmart units are definetly removing a lot of the dust from our house. I have two BreatheSmart units that seem to be working very well. We have an unusually high volume of dust in our house. The source is probably our coal burner. We have used a coal burner for 25 years without this problem. So we can't be sure of the dust source. I will say the BreatheSmart units have helped a lot, but they have not removed 100% of the dust. We get a noticeable amount of dust every two or three days on the furniture. Before the BreatheSmart units were installed we could notice a lot of new dust on the furniture everyday. My next move is to shut down the coal burner to see what happens. One of the units is noticeably noisier than the other when they are both running at the same speed. It seems like there is some internal vibration with the noisy unit.

DEFECTIVE 2x Purchased the I-75 last year and upon arrival, when plugging it in, it was defective. I returned it and cancelled the subscription for the filter. I just received a filter for that device I no longer own. Had to call customer service to get a Return label. Never received it via email so called again. This took 30 mins on the phone .. ABSURD! Thought I'd give them another chance... I took advantage of the BOGO deal and purchased 2 devices... One of them is DEFECTIVE AGAIN! So whatever you purchase full price or discounted, I'm 100% getting a defective item. Who does quality control here? This device has no remote control, and the app sucks. Customer service agents are a hit or miss. I'll pass

Bought two and were delivered earlier than I expected. One was for me the other was for my son. The unit is very quiet at low speed, I have to put my hand at the exhaust end to determine if it still working. I rank the product 4 stars because it is very hard to removed the face cover to check if the filter needs replacing. The instruction stated to raise the face plate up, but it will not budge (my son had to force it by pull it up front instead). Because of this issue I am reluctant to check the filter's status because I might break something. (So I plan to do check after 3 months or more given a 24/7 use).

Quite satisfied with Air Purifier and Dehumidifier I purchased an air purifier and dehumidifier and both are functioning well. The dehumidifier arrived with a broken wheel but Alen Corp sent me a new wheel within days after reporting it. The Air Purifier is quite noisy on the highest two settings but we sleep with it right next to our bed on the lowest setting, and hardly notice any noise at all.

Alen - Outstanding Purifiers and Company! We purchased a unit directly from Alen Corp about 5 years ago. The unit had an issue with the fan speed. Alen Corp simply had us send a photo of the unit and a cut cord. A replacement is being shipped out asap. We have loved and used our until almost daily since its purchase! Love these purifiers and Alen customer service is outstanding!!!