Hello /u/JOOOQUUU! Thank you for your submission! The AutoMod thought that your post might be a request type post and has changed the flair accordingly, but if this was wrong feel free to change it back!

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

Wrong sub

3x4? Is this a room or a "tent"

True, but he is buying something "for life" as in health through cleaner air :))

The best is built your own (lookup Corsi-Rosenthal box)

Good one

Or a dog crate?

I assumed they were referencing meters, so roughly 9 3/4x13 feet, which would be a pretty average room dimension

Ah makes sense.

I thought they was growing pot.

What does it say on the box? Air purifiers usually say how much space they are good for.

And they usually over-estimate that, so take large numbers promised by a small air purifier with a grain of salt. Look for the CADR figure, and if they don't post that prominently on the packaging there's probably a really good reason why and you should look elsewhere.

Ya, that sounded closet sized

Are you looking to purify the air or remove odors and aromas?

I recommend the one made by Levoit that looks like this. But yea this will do too.

I’m assuming it’s a closet.

I can’t say it’s for life or that this post belongs here, but after a ton of research I bought this one:

Phillips 2000 series.

The one that does not have an app. The “smart” version is waaay more expensive and it’s not worth it. I’ve been very happy with it.

Do you mean a 3 meter by 4 meter room? A room that is only 3 feet by 4 feet seems like it would be a little small...even if it was a bathroom or a closet.

The unit should list CFM, CADR, or both. This is the best way to approximate how appropriate the unit is for a specific room. If it does not list this, then I would strongly advise not purchasing it. I would also want to know more details on the filter itself. For example, what kind of a filter is it, what is the filter change interval, and how expensive are replacement filters?

Finally, with the absolute minimal details listed on the box, I would assume that this system (like most of the consumer units) is going to cover particulate filtration only (i.e., particulate matter, or PM). It will not reduce volatile organic compounds (VOCs) or nitrogen oxides, which would require a chemical filtration component that only specialized purifiers have. And as it does not remove VOCs, it will not make a meaningful impact on odors other than moving the air around (large carbon filters are needed to actually remove odors through the process of adsorption, which are available with specialty purifiers.)

If the room is 12 feet by 16 feet, that is about 200 square feet. You would be very amply covered by something like a Winix 5500-2, which would provide a high level of air exchanges even on a lower (quieter) fan setting. The 5500-2 can be purchased for as little as $150 and replacement filters are reasonably priced. Energy usage and noise is also very reasonable. Like most of the consumer filters, it covers particulate filtration but does not make meaningful impacts on VOCs or NOx.

This is a very important question because it takes a specialty purifier to remove odors and most of the units on the market will not do this.

I suppose, but a carbon canister and in-line fan should do the trick pretty well.

What is this, a school for ants?!

Your vacuum cleaner is the best air purifier you own. Well depends on what you're trying to get out of the air.

3x4 FEET? Or 3x4 meters. Actually, it doesn't matter. My answer would be no to either. Something that small might look impressive, and they might make big claims, but the reality is that your satisfaction with it's performance is going to be smaller than it's size.

I say this as someone who's been using room air filters for decades for an asthmatic wife. I've tried a bunch of products. The only ones that have come anywhere close to BIFL are the Honeywells that use honking big air filters like those you'd find in a car. Except bigger. Much bigger. They aren't the quietest. They aren't the smallest. But they work, and when the filters get full, you can replace the filters. That can be surprisingly important - the ability to replace the filters. Surprising how many manufacturers products I haven't been able to keep going for the simple reason that I could no longer get an essential part - like a filter that fits.

Since we’re already off topic, a 3x4 room isn’t big enough to lay down.

Absolutely. That would definitely do the trick provided the fan is forcing air through the canister (and not around it), the carbon blend is good for VOC adsorption, and a sufficient dwell time is achieved. Many of the grow filters on the market are great for this. There are also specialty purifiers with large carbon canisters as well (on the order of 20-50 pounds), some of which have oxidizers added as well to cover certain pollutants that carbon alone cannot remove. (I am a bit of an air purifier geek.)

Purified air

This one is 20$

Whats the merv rating? is it hepa?

Bigger hepa units on low work much more quietly than a small unit on high. Fyi. The boxes usually over estimate the room area they can clean. I always buy bigger units. There are a lot of reviews on Twitter. I have had some basic Honeywell units for many years.

More like than not this would not be a very good product and would likely not make any notable difference in air quality. The lack of any technical information, combined with the price, suggest this. If price is an issue, I would suggest constructing a Corsi-Rosenthal Box, which can be put together for the cost of box fans, MERV-13 or higher furnace filters, and tape. These move large quantities of air using filters of known level of performance to make a huge difference in reducing particle counts.

Coway mega +++

Here are some reco for the size of your room.
Coway AP-1512HH Mighty Air Purifier: This air purifier has a compact design and can clean the air in a room up to 361 square feet. It features a four-stage filtration system with a CADR rating of 233 for pollen, 246 for dust, and 240 for smoke.

Winix 5500-2 Air Purifier: This air purifier is designed for medium to large rooms and has a CADR rating of 243 for pollen, 246 for dust, and 232 for smoke. It has a sleek design and a three-stage filtration system, including a True HEPA filter.

Levoit Core 300 Air Purifier: This air purifier is compact and efficient, with a CADR rating of 140 for pollen, 145 for dust, and 141 for smoke. It features a three-stage filtration system, including a True HEPA filter, and is suitable for rooms up to 219 square feet.

Honeywell HPA300 Air Purifier: This air purifier is designed for large rooms with a CADR rating of 300 for pollen, 320 for dust, and 300 for smoke. It features a three-stage filtration system and has a sleek, modern design.