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!

Pros: It does what is advertised. My cat hair allergies is much reduced at this fan sucks up the floating hairs. Easy to assemble (snap on feet). Easy to change filter (two clips).Con: Its very loud even at slow speed.

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.

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.

Almost didn't purchase as had seen a different false review stating the 3M Merv 14 MPR 2500 Filtrete Filters wouldn't fit, but they do actually fit in perfectly without being buckled or squashed. Granted it is a tight fit and you need to insert in properly and make sure you mount the bottom flat edge in first so you can use hand pressure to flex top plastic to get inserted while making sure the 2 side rotating clips are fully out of the way, but it does fit perfect per attached picture. Cheapest online place I found to buy the filters was Costco 4 pack. Works great blowing close to desk chair, but this is nowhere near airflow of a regular Box Fan as most reviews mentioned, it is just a cheap air-purifier substitute with low airflow on lowest acceptable sound volume speed 1 and unsure of motor lifespan so giving 4 star rating to start.2024-07-17 Update - Ordered a 2nd Unit and shipping box arrived damaged which damaged unit inside. Received replacement unit from Amazon and the fan motor itself has an issue as it is nowhere near the 3 speeds of the original good unit I own as the highest speed 3 on the 2nd unit is not even 1/2 the fan speed and airflow CFM on slowest level 1 speed on my first unit and it is very noticeable just by the sound difference between the 2 units. I never would have known the motor/potentiometer dial on the 2nd unit isn't working properly if I didn't already own one so reducing star rating from 4 to 3 stars for potentially poor Lasko quality control.

Before I found this product I would tape 20x20 filters to the back of box fans, it got the job done but I wouldn't say it's the safest. Box fans have been known to start fires actually tipping over and motors overheating, and slapping a filter on it strains the motor. Really liked the concept of using a easily movable fan to not only to move air but purify it and filters that were readily available at any big store. This product satisfies exactly what I was looking for- an oversized motor particularly designed for the task, filter housing built in on the back, 20x20 standard filter easily available with MEVR variety. I kept one and gave my buddy one because he was remodeling his house, said it really kept down the drywall dust. If you've seen my other reviews, I like industrial products, they're built to last with heavy duty parts. Sure they cost a bit more but they're going to last a lot longer and replacing the same item a few times you'll save yourself time and effort by just doing it right the first time.