Honeywell - HPA8350B

I use the Honeywell HPA 300. It is a bit pricy, but it does an amazing job on odors, and also a really good job on pet hair. One unit is not going to cover an entire house though. It is more like one unit per large room for pet hair issues.

I have a Honeywell 50250 from 7 years ago. They don't make them anymore and replacement filters are all aftermarket for them on Amazon. (Probably because they work so good) I've seen the units on ebay though. Amazing machine. Runs 24/7. I move it to the living room from my bedroom when I've cooked something in the kitchen that made a lot of smoke or is real potent like fish or onions. That thing takes care of it totally in about an hour. Smoke made it in the house from a house fire a block down. Took care of that in a day on high. With that model off the market new I've bought the replacement size unit for the living room. Honeywell HPA 300. Bought it 3 years ago. Only pulls in air from one side. Doesn't trap as much dust or get kitchen smells out well enough. The fan started making a squeaking noise this past spring. If you can find that 50250. I highly recommend it.

I have a Honeywell 300 series, my guests with cat allergies can tolerate being in the same room when it's on. It has a 250 CADR. I have lived for years with a cat with this issue despite allergist's advice. My rules: No cat in bedroom, and if possible on same floor, frequent litterbox changes by someone else or wearing an N95, giving cat fish supplement or using Allerpet product to moisturize their skin, weekly vacuuming and avoiding touching cat and washing hands after. Of course this works best with someone else in house to give the poor kitty some love... good luck.

I have two Honeywell large room air filters. They are sub $200. The filters are readily available. I blow them out with an air compressor outside and reuse them until I can’t. I run them on low 24/7 and they have a turbo setting. They come in white or black. HPA 300 series Unless you want those electronic ones that have some dubious science imo. They are pretty much alll the same except for the filtered air per minute, filters, and number of pleats. The more pleats the less you need to change filters.

Just stay away from the Honeywell HPA models. They all develop a burning smell. I've swapped my 2 out a total of 6 times.

You can get a HEPA filter air purifier (Honeywell makes decent ones) to deal with PLA and TPU, they dont emit the toxic VOCs like ABS, Nylon and PC, but they do still emit fine particles. Having it enclosed like you do is going to prevent a lot of those fine particles from scattering through the room though so its a big help. As a rule I try to not have my printers in the same room I work, but if you must, that HEPA filter will help reduce the fine particles a lot. For the more toxic materials, absolute best bet is to create a negative air pressure environment while venting outside through a window or port. If you cant or want even more reassurance, running a carbon filter does a lot to help. There are specialized air purifiers for VOCs but theyre not cheap. A really good one you can get is from Heygears, called the GreenPrint Purification Unit. Just know it's specifically for VOCs as it doesn't trap particles, it destroys them (so you still want a HEPA for the fine particles). This air purifier doesnt need filters though, it doesnt trap VOCs like a carbon filter which can become saturated and need replacements. It actively breaks down VOCs, so it just runs indefinitely with full efficiency, no need to swap filters.

We have a Honeywell with a hepa filter. It has been great, though a tad expensive.