Exhalaron

OP, I’m copy-pasting this from a previous comment of mine. FYI: Jim Rosenthal developed and provided testing data for what he calls a “mini mini” Corsi -Rosenthal box. He came up with it for his rideshare-driving nephew. I made one for use when I was in a carpool and have purchased those and many other filters from him. Because it uses pc fans w/ USB connections, it can be plugged into your car’s USB port or powered by a basic charger. Here - https://www.texairfilters.com/enjoy-clean-air-while-you-drive-with-the-mini-mini-corsi-rosenthal-box/ ETA: There’s another one he calls the “mini” but it’s sized for a bedroom. Search his “Articles” tab for different versions w/ different fans. Here’s one with pc fans - https://www.texairfilters.com/a-mini-corsi-rosenthal-box-version-2/

A commercial air purifier that meets all your criteria and actually works as effectively as you want it to will be well over $300. Under $300 you only have two realistic options: build yourself a Corsi-Rosenthal box with computer fans, or buy a Corsi-Rosenthal kit. A CR box with computer fans is going to be quieter than any commercial air purifier, and the filters will be cheaper because they're standard filters you can buy at any hardware store instead of proprietary filters you can only buy from one company, and by design CR boxes are super easy to maintain. CleanAirKits in the US, NorthBox in Canada, and Nukit in China all sell CR box kits with computer fans. The most BIFL option out of these is Nukit, made with steel, while the others are made with wood or acrylic. I have severe allergies myself and I have two CR boxes, a large one I built myself at home, and a small portable one from CleanAirKits for my office or wherever else I might need it. They've made a big difference in my allergy symptoms. Check out the Nukit Tempest mk 2 when it releases later this year, it is planned to have all the features you listed. The other thing with allergies that often gets overlooked is cleaning. Especially if you have pets you are allergic to, you should dust and vacuum your house two or three times a week. Air purifiers alone won't be enough.

100% for smoke, dust and allergies. We use cleanairkits, best performance for the price

Cleanairkits is the most efficient and effective filter I have found

CleanAirKits is the quietest. Dyson second quietest. My Medify MA-112 is pretty quiet too.

MUCH quieter. Engineer Wong uses very loud industrial fans. CleanAirKits uses premium whisper quiet high-static-pressure PC fans. And the fans themselves get better each year, as the manufacturers know how many are being used for CR Boxes and for silent PC builds, and have been optimizing not only for turbulence vibrations and low frequency sounds, but also high-pitched wines that may manifest themselves only under certain power scenarios. We own four AirFanta 3Pro units and about ten different units of varying models of CleanAirKits - and they’re all great - but they’re optimized for different circumstances. I’d have to say my favorite portable model of CleanAirKits is the Exhalaron, my favorite for home use - especially bedroom - use is the Luggable XXL, and we love the AirFanta for travel and use hotel rooms l, and even in the trunk space of our SUV for use the car.

If you're driving a car that you own, then upgrade the cabin air filter to a HEPA filter if you haven't already. Keep the car's fan running as it brings it quite a bit of fresh air. I've seen this ventilation keep the interior's CO2 levels near outdoor air levels or just above even with 2-3 people in the vehicle. Then I've used a Clean Air Kits Exhalaron in the middle of the back seat to mix/filter the air that's farther away from the vents.

I have several air purifiers and my favourite is a PC fan air purifier from North Box. There are various ones on the market but [North Box is Canadian](https://aidankepo.wixsite.com/northboxsystems). It's available directly from their site or through [Donate A Mask](https://shop.evidencebased.ca/collections/cr-boxes-air-purification). What's nice about PC fan air purifiers is that they're really quiet, quite effective and don't rely on proprietary air filters.

As u/ZedZabeth mentioned, making a Corsi Rosenthal box is a good idea. If you can afford it, a PC fan air purifier uses very little energy, is quiet and takes up less space than a classic CR box. If money is really tight, a respirator mask is probably the easiest, most accessible and cheapest solution. I know the prospect of masking at home is unappealing, but even masking from time to time indoors will lower your exposure.

Look up corsi-rosenthal boxes. I just built one last week and I'm way happier with it than my levoit.

Corsi-Rosenthal boxes are what they're called! I have a lot of allergies and I use one of those. They're great.

How handy are you? A Corsi-Rosenthal box is pretty easy to construct out of a box fan and 4-5 filters. Or I've seen ones that use 2 filters and some computer fans that run quieter.