AirFanta - 4Lite Portable

You have a lot of options with that budget: You could get two AirFanta 3 Pros or one Smart Air Blast MKII Or Tower of Power and Triple Exhalaron from Clean Air Kits. For a large space the conventional/pre-built air purifiers will cost more, as you can see with the Smart Air. Also, I highly recommend the AirFanta 4Lite for your husband to take to his treatments. It’s a personal portable air purifier designed to blow a clean stream of air. Coupled with masking in a N95 it’s a great additional layer of mitigation since viruses are a concern. The 3Pro could be brought to treatments as well. I’ve seen people carry it assembled in a large mesh tote bag. It can be powered by a power bank. You could get 3 AirFanta 3Pros and still spend less than one Smart Air.

If you’re able to have some kind of surface to place it facing you when you have appointments then I’d suggest the AirFanta 4Lite which is a portable laminar air flow (not big enough to clean the room, but able to send a straight stream of purified air toward your face if there aren’t strong air currents around). It’s more meant for if you have to eat in an unsafe space. I’ve used mine for meetings in cafes. It’s very sleek and white and fancy looking. Has inbuilt battery (rechargeable) that lasts a few hours; can also be used with power banks. I’ve carried mine in knapsacks but it does take up some space. Also would suggest on top of this the AirFanta 3Pro which is strong enough to clean a room (packs more punch than other purifiers of its size but can be a little more noisy and doesn’t look as sleek for sure as its like a CR box). Mine just stays in my living room. It’s portable (packs flat for carrying, pretty light) but I wouldn’t to dismantle and set it up again more than once or twice a day; it’s a little fiddly. You didn’t ask about masks but just to mention that the Zimi Air is super breathable with no metal pieces. I use the earloop for large conferences and so far it’s kept me safe.