Air Purifier for Home Large Room – Covers Up to 500 Sq Ft, 5-in-1 HEPA Filter System for Allergies, Pets, Smoke, Remove Dust & Odor – Quiet Sleep Mode, High Filtration Efficiency – SILVERONYX, Black

You may have seen on the news in summer of 2018 about the forest fires along the west coast. That was what we were in for a couple of weeks. We had PM2.5 levels hovering between unhealthy (150-200) and very-unhealthy levels (200+) outside with inside PM2.5 levels around 120 to 140. We have a 2,380 sqft house, 1,400 of that is downstairs. While these are rated for 500sqft, a single unit downstairs was enough to keep our PM2.5 levels down to about 40 or 50 despite the area being 3x larger than recommended. They also worked quickly, with a significant drop of PM2.5 levels within an hour of being turned on.We ended up buying 2 of them (1 upstairs and 1 downstairs). The only negative was one of the units was a bit louder than the other (at all levels). But they were quiet enough for the noise to fade into the background and didn't interrupt our TV viewing or anything else. Once the PM2.5 levels outside dropped to 75'ish, the inside dropped to under 10 and it's remained at or below 5 once the smoke finally cleared out (and the rains returned!).An interesting side-effect is when we cook in the kitchen, the purifier next to the kitchen will quickly clean the air (just bought our house and recently discovered the stove-top vent simply vents back into the kitchen).Very glad we bought them. In reality, it seems the major difference between these types of devices is how quiet and quickly they work, but they should all be using a similar filter which is what actually filters the air.Would definitely recommend, I just hope we don't need them next summer.

I was skeptical that this would help, but after a few months of my upstairs apartment neighbors smoking so much cannabis that it had sunk into my furniture and clothes even after a wash, and no help from the landlords, I had to try something.Whatever this filter is doing, it's working. I placed it in our kitchen that had reeked of smoke for weeks and it cleared it up almost entirely within 30 minutes. I keep it in the bedroom now, for the most part. The smell wafts down whenever they light up but it's gone almost instantly and doesn't bother me anymore, or keep me awake when I'm trying to sleep. The fan is quiet and makes for soft white noise at any speed below 3. My computer's fan is louder than the 1 setting, but the 4 and 5 settings do make normal conversation a bit hard to hear. You will very rarely need to run it this high.As an added bonus, I have slight asthma and a cat. I don't know if it was the smoke or my cat (or just a placebo effect) but I find I can breathe easier after running the thing for 10 - 15 minutes with the door closed or even slightly ajar.As an aside, I'm not sure if the particulate detector doesn't work well, or if the neighbor's cannabis doesn't kick it up as much as I think it should, but even though it cycles the smell out quickly, the numbers rarely change and it doesn't increase the speed. It's not a problem - again, it does an amazing job of cleaning up the odors even on its lowest setting - but it's something I've noticed.

We've had two of these units in our house now since December 2019 -- almost 5 years! We burn a wood stove for heat all winter, our summers are dry and dusty, spring is full of pollen. My husband has allergies to dust, pollen, and dander -- I'm bothered by smoke -- and having these little workhorses around (we have two) has made a tremendous difference. They hum along at a steady pace day and night and alert us when air quality is getting poor. They've done triple duty on multiple occasions when wildfire smoke was so bad, we were advised to stay inside for days. They worked HARD hour after hour, and we felt safer, knowing they were doing their job. I'm not typically a review writer, but I was so impressed when I wrote to the company this month after one of our units began acting funny. They immediately responded with incredibly clear, easy instructions for fixing the problem, and my unit is now back to doing its job. We use them every day and I've only had to change the filters 2x since we bought them. (Did I mention we also have a dog?) Cannot say enough good things about this product or the company's customer service.

This review is for the almost identical twins, the Silver Onyx and the OdorStop OSAP5 (and why I like the OSAP5 better)I'm impressed with this type of tower style air purifier. It takes up much less space than comparable flat filter purifiers like the Hathaspace or the Winix. Other comparable tower style air purifiers like the GermGardian have flat long rectangular filters. This one has a barrel type HEPA filter that also has active carbon at the final stage. It filters out the micro-particles first then eliminates the odors. It's backwards from the way most others do it but I think it works better. After that, the Silver Onyx / OSAP5 sterilizes the filtered air with UV light (if the option is turned on) and spits out negative ions (if the option is turned on) that attach to dirty air molecules and force them down (preferably into the filter and not your carpet). Seeing that both the Silver Onyx and the OdorStop OSAP5 are almost identical, including the fact that they use the same replacement filter, here are the 2 main reasons I like the OSAP5 better.1. The OSAP5 has breather holes 360 degrees all the way around the air inlet maximizing the full potential of the filter. The Silver Onyx only allows air in through the back of the unit hampering it's ability to pull in dirty air from every direction and with less breather holes, it's hampered even more.2. The OSAP5 blows the purified air straight up. The Silver Onyx has a tapered vent at the top that blows the purified air out at about a 55 degree angle and because of this, the Silver Onyx recirculates it's own purified air way too much.I really enjoy the way these things work and if you want to see another review concerning certain features look for Saved Forever's review of the OSAP5.