Airmega 300 (model 300)

Yeah, your boyfriend is totally wrong. KNKA appears to be a junk rebadged brand. These are typically very cheap with poor build quality, short-lived replacement filter availability, and lousy customer service. The 2,325 sq. ft. coverage rating is highly misleading. This is likely at 1 Air Change per Hour (ACH) which is far too low. You want a minimum of 4.8 - 5 ACH for relatively normal particulate pollution levels. Biggest red flag: no Clean Air Delivery Rates (CADRs) listed. Coway is a high quality consumer-grade brand. The [Airmega 300](https://cowaymega.com/products/airmega-300?variant=34493568647327) has a 5 year warranty, is energy efficient, and relatively quiet. Top Smoke CADR is 285 CFM. This means the largest room size it can handle is 427 sq. ft. with an 8 ft. ceiling. You can use the discount code **COWAYMEGA10** on Coway's website for an additional 10% off, which brings the price down to $398.70. Unfortunately neither of these will combat the chemical odors from lawn care treatments. Odors are gases or vapors which require many pounds of sorbent media. Sorbent media are activated carbon, activated alumina, or synthetic zeolites. Neither the KNKA nor the Coway have very much activated carbon; they are designed to capture particulates (such as airborne mold spores). Heavyweight sorbent media purifiers are very expensive, very loud, and clean the air more slowly than particulates-focused purifiers. An entry-level unit from a brand like AllerAir would be at least $600. And depending on the exact gaseous "species" you're smelling, you may need chemically modified sorbents to enhance removal capacities.

No, Dyson is one of the worst! The HP09 has terrible Clean Air Delivery Rates (CADRs). They just know how to market effectively. As **Rule 4** and the AutoModerator comment repeats, it's helpful to know the ceiling height. I'll assume it's 2.4 meters. 60 m^(2) x 2.4 = 144 m^(3). For rooms measured in meters, CADR should be at least 3 times a room's volume (in m^(3)). So the minimum CADR should be 432 m^(3)/h. If you have [allergies, health conditions, high pollution, etc.](https://www.reddit.com/r/AirPurifiers/wiki/index/how_to_choose_an_air_purifier_for_particulates/#wiki_when_higher_than_normal_cadrs_may_be_needed), multiply the room's volume by 4-6. So CADRs of 576 - 864 m^(3)/h. Coway is a high quality brand that's relatively quiet. I don't know exactly where you are, so I don't know what's available to you. But the [Coway Airmega 400](https://www.amazon.co.uk/purifier-restaurant-certified-HyperCaptive-filtration/dp/B099S9Y285) would be a very good fit (Amazon UK website linked). If you can't find that, the Coway Airmega 300 might suffice... although you may want to supplement it with a smaller Coway model like the Coway Airmega Jet.

coway. coway hands down. with two cockatiels i keep one thats supposed to cover 2500 sqft in a tiny bedroom because well…. it requires it, but we want a second one for the rest of the house. they do purifying and have charcoal filters for odors which has been great for cooking etc in the past

I have two Coway Airmegas (300 and 400) and one Austin Air Bedroom Machine. They've all been running for 24 hours a day for over 5 years and have held up great. They are all easy to move around. The Coways are light and the Austin Air is heavier but has wheels. If you don't want to clean the outer filter at least monthly, don't get a Coway. If you can't deal with something that's pretty loud on the highest setting, don't get an Austin Air.

I have two of those for bedrooms and the bigger airmega 300 for kitchen/dining/living area. They've been working great for me (I get impacted by wildfires and my neighbors fireplaces).

Get whatever coway is on sale, I like the 240/250/300/400