4WDKING Rechargeable Electrical Air Purifying, Reusable Portable Air Purifier with HEPA Filter for Sleeping Outdoor Sports Housework

I turned this on when I stepped out of the car at the airport. I took off the device for security and put it in a zip-lok that I brought just for this purpose. To do that, I disconnected the air tube at the device and tucked the end of the tube inside my mask which stayed on my face. Got through security, stopped and immediately put the device back on, left it on for the entire flight until I was inside my rental car at the other end. When I moved my mask aside to have a cup of coffee and a bite on the plane, I left the mask hanging on one ear so that clean air was still blowing. Do try it on at home and get your setup for how you are going to wear the device. I initially had it slung across my chest, fixed near the top. Once I was on the plane, I found that I was a lot more comfortable with the stretchy belt I'd chosen just wrapped around my middle, up high, like a high-waisted belt. That was super comfortable. Also, this will only run on high for 4-5 hours I believe it is, so I also bought a power brick, brought proper cable, and ran it off the power brick when its own power ran out. The seller has stated in Questions/Answers that it is ok to run it off a power brick. But, there is a limit on the size of a power brick you can bring on an airplane. Check on that limit to make sure they will allow yours in your carry-on. I had way more power than required. I also hung a negative-ion generator from that same belt, next to the device. So I felt very protected. And as I have asthma and can get a bit panicky wearing a mask, this device allowed me to be 100% comfortable and happy with my mask setup. Amazing comfort with cool breeze inside my mask. Last, what convinced me to try this were the videos from the surgical nurse and the dentist (his video is on the original, aluminum version-- but buy this plastic one, it's an improvement). They were 100% right on about the benefits of this device.

I am real gald to find this on Amazon. I can wear it to the grocery store and don't has to worry about it going dead on me. It stay charge for a very long time ⌛️

Caveats Not designed for viral protection . Powered air creates positive pressure that amplifies all face masks fatal flaw, unfiltered exhalation leakage. So wearer gets gobs of filtered air , but increases exposure risk to those around you. We try to mitigate this and minimize leakage with simple modifications that will work to improve any mask. Tighten mask to face with any mask frame, home made bracket frame made from 1/2" garden ties, and most efficent 8-10" cut off nylons panty hose used over entire mask. Close any gaps 3/8 closed cell foam adhesive weather stripping applied to inside edge especially around nose piece. We add standard mask exhaust valve with filter material fixed to inside of valve to provide lower bypass pressure. any mask with exhaust valve should have filter material fixed to inside. Otherwise it is just a virus concentrating and aiming device. All brands claim h13 hepa filter. Some have niosh or china certification print on filters. We add layer of Merv 16 Filti face mask material from filti.com or any of electrostatic melt blown polypropelene available here on amazon on top of hepa filter. Setting aside filter QC issues, non compliant materials , or unseen defect to these tiny hepa filters we consider this an imperative redundancy for viral filtration. It probably brings filtration to N99 level and reduces air flow volume 10-15%. We have been modifying all 4 brands of these for mask intolerant, exercise demand, and high exposure users. There is little functionality difference between brands. The airdog has round shape and also makes a small desk top unit The simple advantages, The models with KN95 mask fit most faces very well. great fresh air source for smoke and pollutants out of box good experience with battery life, component quality, adequate airflow up to moderate exercise. these make a great adjunct without tubing worn around neck blowing filtered cooling air while wearing a normal mask underneath a face shield. All materials except Filti nano filter material available on amazon. an inventive negative/positive electric demand valve would make these a life saver for frontliners who deserve a lot better than a cotton bandana.

This device is a gift from heaven for people who have a hard time breathing through ordinary masks. It works by pulling air in through a 99% HEPA filter piping it into a KN-95 mask and then out through the mask. There are 3 speeds so as you need more air you can increase the speed and airflow. It is not industrial quality but if you care for it the device is reliable and easily recharged via USB. And you can get extra HEPA filters. You can use ANY mask just by cutting out a 1/2" hole and affixing the hose port to the mask. Now comes the down side. The device creates a positive pressure inside the mask. It protects the wearer beautifully. BUT that same pressure may reduce protection for others. Why if the mask is KN-95? It's because the positive pressure has to go somewhere and it has two choices... through the KN-95 mask filter or find a place that is easier to go through like a small opening on the side of the mask. This can cause your unfiltered exhalation to escape the mask. If you socially distance and stay away from people, this should be no problem. if you do not have COVID it is no problem. But if you have COVID and can tolerate a KN-95 mask, that would be more protective of others so long as the mask is well-fitted. I go out once a month and for me this is heaven sent.

I don’t leave a lot of reviews but I had to on this one. I bought this mask/filter fan for cutting grass. I get bad sinus infections. It’s too hot in Bama in the summer to just wear a mask. This thing keeps most of the dust out and actually keeps your face cool. I used it yesterday to bushhog 30 acres. It worked 8hrs straight on medium setting and is still going without a charge. Probably could have ran it on high. Would definitely buy again. I washed out the filter and will do that a few times but I also order extra filters.

Works well. I modified it in two ways. I made a 1" wide nylon strap at ACE with a clip in buckle to make it practical to wear around my waist. I got a non-rebreathing oxygen mask and removed the main O2 fitting. (Mountain Medical, $2.80 per mask plus shipping.) I also put a piece of tape over the right side vent holes. This works. The silicon tube fits perfectly into the main O2 fitting in front. This mask is comfortable to wear for a couple hours at the range. People can see your face through it, and you don't have creases dug into your face like the poly-masks that comes with this unit. The elastic strap for the O2 mask isn't perfect, but it works well enough. The filter definitely is working. 2 sessions of a couple hours and it's visibly darkened in the center of the HEPA filter. This mask works with my range eyegear. It's comfortable.

I hate masks and respirators because I struggle to breath through them. This device forces a light stream of filtered air though to a N95 mask for reducing that struggle. I can get several hours of comfortable breathing before the unit needs to be recharged. When the N95 mask wears out, you can use any N95 mask with it by punching a hole in the mask. There are a couple of dislikes though. One, I struggle to get the blower device attached to my arm and two, the hose that goes from the blower device to the mask tends to kink pretty easy.

I really wanted this to work. If you blow enough filtered air into a mask, it keeps unfiltered air out of the mask. But the air needs to be high enough flow, and it needs to be properly filterd .Unfortunately, the output of the blower isn't 99.9% like the listing claims, it's more like 75%. Massive difference. It's as if nobody actually tested the unit *as a whole* (not just the filter media on its own in a lab) with measuring instruments before marketing it around the world. I'm not sure why the output of the blower has such low total filtration efficiency. It could be poor filter media, or the filter and blower may not be properly sealed, allowing unfiltered air to leak into the output. Or some combination of both. Ultimately it doesn't matter what is causing the poor total filtration efficiency, only that it is low, as in leaky surgical mask low.