Lasko Air Flex 20" 2-in-1 Box Fan and Air Purifier in One with MERV10 Air Purifying Filter for Cleaner and Cooling Breeze, 3 Speeds, Steel Body, FF305

I usually just tape a 20x20x1 box filter to my fans but this makes it easier to use and to change out filters as needed. Solid base and doesnt seem like it wants to tip over at all. Fairly quiet and works great. I did a video on my youtube channel about it. This evn came with a filter!

Absolutely love this! You can save yourself hundreds by choosing this instead of an expensive air purifier that doesn’t work as well. The DIY purified box fan is effective, but this one looks much better in your space.As for noise, it’s about as loud as a typical box fan—noticeable at first, but it quickly fades into background white noise.

The media could not be loaded. Lasko Air Flex 2-in-1 20-inch Box Fan and Air Purifier in OneThis product fills a niche between ordinary fans and HEPA air purifiers.I wanted something like this for years, since I tried putting a pleated furnace filter on an old Lasko box fan but after a few months of use could smell the motor starting to burn up. Family members are allergic to pollen, so with this fan on cool evenings I can finally open the windows and use this fan to blow in cool, filtered air. I substituted a MERV 8 filter that's enough to filter pollen and still provide decent air flow (enough to still consider it a fan!) The MERV 8 filters ("FPR" 4-5), rated to capture 70 - 84.9% of 3 - 10 Micron particles, were 3 for $10-13 at a local home improvement store. You can't get more economical than that. After 3 years using it 2-3 hrs/day in the summer I'm still satisfied with the air flow (I do vacuum out the filter occasionally using a bagged upright vacuum with a high efficiency dust bag).I recently tried it as an air purifier by putting in a brand new 3M Filtrete MPR 2500 (MERV 14) filter. 3M rates these as removing 77% of 0.3 - 1 Micron particles (compared to HEPA 99.97%), but the air flow is very low. Low enough that it's not really a fan any more; with this filter I can barely feel any air flow 2' from the fan. Lasko says the Air Flex has a Clean Air Delivery Rate (CADR) of 42; they don't specify if this is for pollen, dust or smoke. 42 is very low which is why I can barely feel air moving through with the MERV 14 filter. For comparison a Honewyell HPA-200 has a CADR of 180 for pollen and 200 for tobacco smoke. The HPA-200 is about 2.5 times the price, but it provides a much higher rate of filtered air, though it's pretty useless as a cooling fan since it blows straight up.I also tried the MERV 10 filter that came with the Air Flex. I think the air flow is a little better with the MERV 8, and the price is definitely better. For reference, here are filter efficiency specs from several internet sites:_____ MERV ___Micron particle size_______#_____ 0.3-1____1-3_____3-10MERV _8_____ <20%___<20%___70-85%MERV 10_____ <20%___50-64%_>=85%MERV 14_____ 75-84%_>=90%__>=90%While the MERV 10 filter must capture more of something than the MERV 8, it's still not going to do much for smoke because "Particles from smoke tend to be very small, with a size range near the wavelength of visible light (0.4–0.7 micrometers)" (WILDFIRE SMOKE: A GUIDE FOR PUBLIC HEALTH OFFICIALS, P. 12. EPA Aug 2019).HEPA air purifiers are overkill if you only have allergies and need to filter pollen. The cost of replacement HEPA filters in 1-2 years would be more than this whole fan. So if you want to save money, cool yourself off, and filter pollen, mold spores, and most dust, get this and put a MERV 8 filter in it. Once you have it, in a pinch if you need to purify a small amount of air because of smoke, airborne virus particles, etc. you can put a MERV 13 or 14 filter in and it will help a little bit. But if you really need to *purify* a lot of air, and don't need a cooling fan, buy a HEPA air purifier.I made two videos to try to demonstrate the difference in air flow, not knowing Amazon only allowed 1 video per review. The videos don't show the full effect you feel: with MERV 8 you can still feel a cooling breeze, not with MERV 14. I included the MERV 14 video, but you'll have to take my word for it that although the streamer (tissue) moving quite a bit, it's a wimpy breeze.P.S. if someone has had success taping a pleated filter to an ordinary box fan and it worked for years, please post the details (like which brand and model of fan & filter).18 Jan 2022 update: added MERV 14 info.4 Dec 2023 update: updated years of use and MERV 8 filter price. Increased rating from 4 to 5 because long term use demonstrates it still performs as it did when new. Reformatted the MERV 8,10,14 table for (hopefully) better readability. Also bought a 2nd one for my son, who requested it instead of an air purifier.

This only arrived yesterday so I may need to update this, but, based on this limited experience I can already tell what a lot of writers of negative reviews seem to fail to understand. This is not an air purifier AND a fan, it's an air purifier OR a fan. That's a subtle, yet significant difference.Take the filter out, it's a fan, and quite a forceful one.Put the filter in, it's an air purifier, and not a fan. Thus all the people complaining about a lack of air flow I can only say either take the filter out or adjust your unreasonable expectations. Of course the air flow is significantly less if you put a MERV 10 or higher filter in there. It would be weird if the filter didn't have that effect.Having said that, there is still considerable air flow with the filter in it so I don't know where the complaints are based on that claim there is almost no discernable air flow when the filter is in. Perhaps your filter is old and completely clogged up?Is it loud? That depends on its location. In my case, I use it in my garage either as a fan with hot weather or to ventilate after a painting project, or, after wood sawing, as an air purifier. In that location, the volume of the thing does not exceed my expectations. If you put this in your bedroom while you're trying to sleep, well, there are better products on the market for that purpose.My guess is this thing was developed with shopworkers in mind who were MacGyvering filters with ducttape to a box fan and burning up the fan. With that purpose in mind, I think this thing is perfect. In fact, it's how I found it after watching a few of those DIY videos on YouTube. The thought occurred "might there be a box fan with a built-in filter available?" Lo and behold, there is one. This is it folks.You can't water ski with it either, but that doesn't justifiy anything less than five stars.UPDATE: May 2023. I've had this fantastic fan for two years now and it is exactly as I described on day two when I wrote the above review. At one point I broke one of the feet of the fan, but learned you can actually order a replacement for it for something like $8. This thing really proves its value when using my table saw. I have a shopvac hooked up to the table saw, I use my table saw on the edge of my garage, and then I use the fan (without filter) to blow from behind me to ensure no sawdust gets into the garage. This works great. When it's too cold to open the garage door, I hang the fan (with filter this time) on a hook from the garage door rails, and let it do its thing for an hour after I'm done. The random rocking left to right from the fan on the hook ensures that all the air in the garage has gone through the filter at least once, and all the fine particles have been filtered out. By now, I have replaced the original MERV 10 filter with a MERV 13 filter so it gets even smaller particles. It's great!