Classic 605

I also have a couple of BlueAir and the scheduling feature for smart purifiers is very nice to have. I have it set to run on the lowest fan setting all the time which is so quiet it's undetectable, and ramp it up for a few hours in the afternoon right before we get home from work.

The Classic Blueair models with carbon filters work fabulously, yet I have only seen them priced as low as $300 when on clearance. You can still easily get filters for clearance models, though.

I have the Blueair 211 and Classic 605. Both are great air purifiers and make great noise on high, but they appear to be older models, so may not be easy to find. If you end up buying an air purifier that is too quiet, consider also getting LectroFan Classic White Noise Machine. It has lots of fan sound choices and is the only sound machine I have ever used that is loud enough for me.

I have one and think it is worth $50. I got it at Blueair and it was on sale for $300 or so off. It's a very expensive air purifier and three filters are need. If you want odor control, too, you must get the [Classic 500/600 Series DualProtection Filter](https://www.blueair.com/products/500-600-series-dualprotection), as opposed to the filters that just clean the room. They range from $120-150 for three, depending on where you buy them online. The Blueair website even has a subscription plan where you get a discount for subscribing. I'm using it in a foyer which is connected to a living room and dining room, and it works fine. The foyer is right off the breakfast nook and kitchen, and it does an excellent job eliminating cooking smells that drift into the foyer and can travel upstairs. The first two speeds are quiet, but the third highest speed is very, very loud. I also have the Blueair 211+ and 211 Auto in other rooms and really like them, too. If I need air purifiers in the future, I will always buy Blueair.

BlueAir. I have both the ones that use fabric as a pre-filter, and the old classic Model 600 ones that were on sale hundreds off. Check their website for sales. With the fabric ones, you simply slip off the fabric and wash in the washing machine.

The BlueAir Classics have plastic tops and the flip up control panels are plastic…of and so are the panels themselves at least. Nice units though.

My experience is with the Blueair Classic 605 model. Not sure if that is before or after the 400.

We use BlueAir Classic, they’re quite effective and are WiFi enabled. The companion app is sometimes frustrating to use but it’s outweighed by the fact that they have an API and can be automated. So I have the purifiers run a different speeds based on the values of our IKEA Vindstyrka.

Every house has a smell, coming home from travel you will notice your own. During Covid purchased an oversized for my space hepa air cleaner (blue air) with charcoal oder eliminator and since my house has no smell. Zero. Even when I run a scent diffuser it doesn’t smell beyond the room it’s in. I recommend all the cleaning suggestions, this is more long term. Mine runs 24x7 even when gone for a week or more. Some may be uncomfortable with that, but that’s for the insurance subreddit :-).

Used purifiers can be a good deal, but a new filter for this model is well over $100 so your cost of ownership is going to be expensive going forward. Need to make sure you’re ok with those costs BlueAir has almost exclusively switched to circular filters, so there’s always a chance they will stop producing replacement filters for this model at some point. Also, purifiers are not designed to eliminate odors even though they market them that way. They can help, but it’s not going to make a huge difference. Also you have a very large space at 800sq ft, so you will most likely need multiple units to properly clean your air

Blue Air makes the best HEPA purifiers. Honestly though if your allergy is to dust/dust mites, you don't need filtration as fine as HEPA. Change your HVAC filters twice as often as the directions call for, vacuum every day with a good vacuum, and if you own your house swap the carpets for hard flooring.

I have a blue air in my bedroom, and I keep my bedroom door shut. Works great

Blueair imo because they have washable prefilters, and pet hair and dander is large and honestly doesn't need HEPA filters to clear it out the way, say, smoke does.  That being said, a robot vacuum that runs daily will be more useful overall than a filter, and a nice hand vacuum you don't mind using for upholstery

Blue air. The prefilter is washable. The allergens you're mentioning don't require a HEPA filter, so it's the prefilter doing most of of the work for you.  The biggest fix for indoor allergies is to clean your house, though. Vacuum daily, wash bedding weekly, blinds vs shades or curtains, put knickknacks inside cabinets not open shelves so it's easy to dust, etc. 

I have an air purifier in the room my litterbox is in. Look for one that has charcoal in the filter or prefilter. I have allergies so I have a few brands of air purifiers around the house. I like my BlueAir the best because the prefilter is just washable fabric, and the actual filter lasts a long time if I wash the prefilter every couple months.  The real cost of purifiers is filters. The brand name ones are usually better than off brand, and some have to be changed more than others. 

Blueair has a small one that would fit that space for $99 on Amzn or other retailers. I have next size up and so far so good and noticeable decrease in dust. I like being able to control it and monitor its cleaning via the app. Not advocating for the company other than after doing some research I settled on them and so far am happy.

I have a Blueair for small room and can really sense a difference. I like the app as well to track purity and change settings. So many options out there though.

We run 3 in our house, one in the main living area (diy pc fan with hvac filters), and one in each bedroom (blue air brand or something, I think). Also consider plastic on leaky windows (cheap sliders).

The replacement filters cost too much and hold only 4ish months