I bought this mostly because it was the best looking air purifier out there and my last one ...
354937
I bought this mostly because it was the best looking air purifier out there and my last one didn't have a replacement filter and cleaning it was destroying it.
My place is extremely dusty and it hasn't helped with anything, even when I just replace the filter. Now it's just a really expensive white noise maker in the corner of my bedroom.
4925158
I love this air purifier.  I have 2 dogs, and unfortunately I'm allergic to dogs.  They're never allowed in our bedroom so I'm okay through the night and into the morning.  However, after being in the common living areas of our home all day, my nose would be very congested by late afternoon/early evening.

Since getting this Fellowes air purifier, I've parked it near me between the den and the living room.  It's on the "high" setting all day.  It's working, my nose doesn't get congested in the afternoon & evening!  Love it!  I barely notice the noise coming from it when it's on "high" setting, it's no louder or noticeable than my house's central air.  (Note:  Some reviewers say they can really hear the PlasmaTRUE ionizer, but I can't.  I just hear the fan running - I can't hear any high pitched whine.  But you might, if you have very good hearing that's never been damaged.)

Electricity cost:  I keep this air purifier running 24 hours a day on the "high" setting and because I was curious, I plugged this air purifier into a watt meter.  On the high setting, running 24/7, it will cost me a little less than $9 a year in electricity costs.

Downsides?  The Turbo setting sounds like it's getting ready to become airborne or something, it's rather noisy - but boy does it move a lot of air, so the noise is to be expected.  Also, if you're intending to use this in your bedroom and you like a pitch dark room, the lights on the front display are bothersome, you'll have to cover the display panel with something.

**UPDATE October 31, 2012**  After 7-8 months of use, the red carbon filter light came on.  I checked and sure enough, the filter was covered with a super thick layer of dust (it was probably a 5mm thick layer), which I then vacuumed off. The purifier really did figure out that it was being choked with dust, and I'd noticed in the past week or so that my stuffy nose was returning... the purifier wasn't working as optimally with that thick layer of dust on the filter, so I'll be sure to maintain the filters from now on.

**2nd update: September 2013**  Still liking this Fellowes AP-230PH, and I also bought the AP-300PH several months ago.  Despite these two air purifiers running on "high" 24 hours a day, it's a miracle that we haven't had an increase in our electricity bills (we've actually had our lowest usage ever when comparing the same months over the last 3 years, so these air purifiers are not electricity hogs).
1527029
Sadly, even though the price and the statistics for this air purifier were perfect for the needs I have(well, my wife and her allergies to...just about everything) I have to rate it as "Didn't like it" because it showed up DoA. There is a kill switch in the back that tells the unit if the filter is installed. The one in the unit I received was broken and the unit would not power on.
I wound up buying a TPP540 for a bit more money. It works though I like the looks of the 440 better.
1799905
this item was the second one I got, I like my air purifyer that much. However, I either need 2 more of the same, or a stronger purifyer for my purposes. Thank you
4288248
As I have been using the Fellows Air Purifier for the last Year and half I have noticed that cheap Sented Candles have very sooty wicks in them, by the black soot trapped in the paper filter.
I stopped using Candles for a month to check the condition of the Fellows Air filter. I can share with that the "Fellows HEPA 300" is the best I have used so far,  I have used 2 other brands, I spent $200.00 on my "Fellows HEPA 300" on sale, due to my sever allergies.
I spent $120.00 on a different Air purifier it worked good but I will continue to use my Fellows. The filters are easy to replace and are of great quality, if your like me you will be shocked at first as to how dirty the pure white paper filter gets then like me you will realize just how dirty air can be. I stopped using the candles until I can afford good quality candles, which I found to 15 to 20 dollars each but they last twice as long.
The main feature that I enjoy is the "Auto" feature that increases the draw of air into the machine and the color coated LED lights change from White to Yellow for medium draw and from Yellow to Red for high air draw then when (I my case) the cigarette smoke is cleared from the air the machine returns to normal Low running to conserve energy.
4922490
The best air cleaner-purifier on the market. It eliminates house smells, dust, molds and mildews common in areas of the country with raining weather. I have tried three different brands before and each one had various deficiencies. The Defender 4000 out cleans and out performs all other air cleaners and air purifiers combined and it does not produce O3!
4774214
I've had this unit for about a year, and I still love it!  It has a bunch of different filter sections, but the one I look for is the UV filter.  This is the one that truly makes a difference for me.  I have indoor allergies, including allergies to my 3 cats.  I decided to stop taking allergy meds, and wanted to deal with my allergies more naturally.  I did some research and came to the conclusion that a UV filter is the best way to combat allergens.  After I stopped taking my meds, I would wake up in the middle of the night or morning all stuffed up.  I would try to combat the stuffiness with Vick's Vaporub, which helped to some degree, but not enough.  After plugging the unit in, in m bedroom, I have slept well, and  free breathing, and do not wake up stuffy!  That is huge for me!  I can't recommend this air purifier enough!
1468728
Ive tested this one model at the store. I realize there is a difference between a home and a brick and mortar store when it comes to noise but I have determined that although this unit has a 5 stage filtration system it is the most expensive and NOISEST AND MOST EXPENSIVE air cleaner out of the 4 that I tried out in the store considering the store music and customer chatter in the backround. Is it possible I can look at the noisy air cleaner and write it off as White Noise? Maybe but at this time Im not willing to waste my time on that effort.
3364443
This review has been years in the making but this air purifier is still working great and it's supersensitive to chemical odors which is what I was looking for. If I even use nail polish remover or an aerosol spray (like sunblock) within close proximity to it, it will increase in speed to purify the air (I have it on an Auto setting).
3557850
This is probably the best air purifier ever! I had one that I've been using for 3+ yrs in my room, still running like a champ! Just bought a new one for the living room. Small foot print. Really does a good job. You can feel air movements in room on high, and is very quite on low setting. It is very solid unit! Highly recommended.
4820212
I have several different air purifiers that I've used during the last 15 years, for example:venta aircleaner. bionair BAP412, Appliance Airmaster 101, LightAir, Coway 1008, electrolux oxy3silence.
The Blueair 603 is more silent and gives cleaner air in my experience. Sure the LightAir is truly the most silent (having no moving parts) but its not that effective compared to the blueair.

My only measuring equipment is my allergy sensitive nose and a strong flashlight that I shine near the air outlet on my airpurifiers to see how many particles escape through the filter.
On all the air purifiers except perhaps the Coway and Blueair I can see dust particles fly through the filter (even if just a very small amount). On the blueair I couldn't see a single particle escape, sure I can't see micro\nano particles but since all my previous air purifiers let some visible dust go through and this one doesn't I think that's a good sign.
After about two hour of running the blueair on the lowest speed the whole apartment feels/smells fresh and its easier to breath for me.

I want my airpurifier to be effective and as quiet as possible, the blueair 603 seems to have a good combination of those qualities, so I'm really satisfied.
Now I hope it will last forever so that this will be the last air purifier I buy.
832573
Grret looking and performing air cleaner.  Only issue is that the breather fittings in the assembly are plastic.  The plastic lasted 3 months and done.  Replaced with brass fittings after being told that Kuryakyn is aware of the issue and is working on the solution.  Simple fix and took less than 2 hours with shopping time.
4156903
Hi, I purchased this unit a few months ago for my baby room.  For the past two or three months, not long after I purchased the unit, I noticed a faint foul sour milk smell, which grew stronger by the day and now permeates the entire room.  This is directly contrary to what I wanted for my baby room which is a clean fresh room where my baby can breathe freely without any malodorous smell.  After much investigation, I found out that the smell is actually emanating from the air purifier unit itself.  Please help me resolve this problem or I will have to request a return of the unit.
1725323
I love Crane products first off, I personally think they're the best out there right now without breaking the budget. This air purifier is good if you don't really need a full strong heavy duty purifier. It does help somewhat but its not going to help much. The reason why, if you ask me: the 'HEPA Type' filter. That is what also makes this different from the penguin and shark filter. The other two are true HEPA filters this is only a HEPA type filter. If you need a powerful air purifier, spend the extra money and get the penguin or shark. The product itself is great for a cheaper one or one not expected to be as strong, not too loud but creates a nice white noise and has great safety features and runs well. If you have mild allergies or a mildly dusty area, or just want somewhat cleaner air, this is perfect. But if you have severe allergies, a lot of dust or allergens, or a compromised immune system, definitely upgrade to the shark or penguin true HEPA filter ones.
2345251
I bought a Winix earlier before this one so that is the only one I can compare this to.  This one definitely looks more appealing than the Winix but the Winix does its job better than this one.
The hole in the machine is just for aesthetics.  No air or anything except the light uses that hole.  Air sucks in from the sides of the purifier and exhausts out the top.
It has an auto setting that adjusts according to what the sensor relays.  However, the sensor hardly ever changed on our machine unless we were cooking and there was smoke.  The Winix we have would sense farts and stuff like that but this one would not. Can't tell if that is good or not, you decide.
The light can be turned off but you will still have a blue power light on.  We covered that at night because I am sensitive to lights when I sleep.  Other than that, it was pretty quiet.  I do vacuum the filters at least once a month.
If anything, cleaning it makes you realize how dirty the air actually is you breathe.  Get a purifier!
1186389
I love he air purifier. When I purchased I was told my only complaint would be "sweeping the floors". So true! Whatever is in the air falls on the hardwood floors, better than breathing the dust or whatever :)
I recently cleaned the system but I CANNOT FIGURE OUT WHAT FILTER/FILTERS I NEED TO PURCHASE :(
I anyone can HELP please comment.
2118483
It was a great looking fan. But it stopped working today after 5 short months of use and that was only using it 2 times a month. It blows light/med air depending on your needs. But for me it did the job while it worked. I just think this could have been made to work at least a year to be worth the money.