Honeywell 50100 Enviracaire Air Purifier

I own two of these air filters and I love them. These air filters do an excellent job of cleaning the air in relatively short order and I keep these air filters in the bedrooms for clean air sleeping. I recently moved into a older house that has dirty HVAC ducting and while I am slowly cleaning those ducts out I needed a temporary fix. Additionally, I own a dog that sheds a lot and I have a child with severe allergies. Additionally, I am also an allergy sufferer (mold and cats). After doing extensive research on air filters, I decided to go with this Honeywell 50100 HEPA filter. There are a couple of reasons for decision. 1) The overall cost of this filter is the lowest (unit + replacement filters) I found at the time. I bought the unit for around $80. The average HEPA filter replacement is around $20. 2) The second reason I bought this unit is that I like noise. This is not one of those whisper quiet HEPA filters and that is OK by me. I am a big fan of white noise (after all...Read more

It doesn't explicitly state it in the product description, but the Air Purifier comes with a permanent HEPA filter and one pre-filter. The pre-filter is supposed to be changed every three months and the HEPA filter is supposed to be vacuum cleaned every six months. The pre-filters cost between $10 and $15. I've only had it running for several says and the pre-filter is already covered with dust, so it's really doing what it's supposed to be doing. What's more is that the air is so clean and crisp. The instructions say that you should run the air purifier 24 hours a day, but I think that's a huge waste of energy and only run it when I'm in the room, which seems to work just fine. It does make a lot of noise, but it's white noise, like a window air conditioner or a box fan. I almost didn't buy it because of I was afraid the noise would keep me up at night, but was pleasantly surprised that the white noise helps me sleep more soundly through the night.

Wonderful product I have multiple chemical sensitivity, allergies & asthma I own and use 4 of these machines. Sheryl J.