There are just a few manufacturers of these MOS chips and all the block manufacturers pick one and design according to the chip application note. At best they are useful for relative changes and that's what I use them for - to gauge different VOC mitigation strategies. These cannot be used for accurate absolute VOC measurements. I own about 6 MOS based sensors - including an AirThings model. I've purchased some tools to measure VOCs, CO2, Radon (AirThings) and i will be buying one for particulates as well. That means if you collect one cubic meter of indoor air, separate the PM2.5 it should weigh 70 percent in minutes and cost <$200 :īut - Carbon saturates much, much faster than manufactures admit to or know - within in weeks to days.Ĭarbon is not very effective for some VOCs - eg formaldehydeįor effective low cost particulate filters check out "WireCutter".įor effective low cost carbon canister check out - Terrabloom and Vortex On Particulates:The World Health Organization set minimum standards at 10ug/m^3 for PM2.5. Without hard data all else (especially marketing hype, or the price of a given device), is close to meaningless.Ĭontrary to what's been said this can be achieved at reasonable prices The only way to determine either particulate or VOC reduction is to measure. Even with the $900 price point I would still buy this unit again in a heartbeat! Please feel free to ask me any questions about it or the air purifier hunt in general and I'd be happy to help! In the end I am very glad I decided on this purifier. The rating on this unit at max speed (330CFM) means it can do about 2 Air Changes per Hour (ACH) for about 1200sqft. So in addition to these extremely long lasting and substantial filters it also has a 10 year warranty, a non-offgassing ABS housing, 330CFM capability, high reliability and customer satisfaction, independently certified HEPA 99.5% efficient to 0.003 microns (which they sent me the lab report of) and they’ve been producing this unit for over 2 decades now, so you will never have a problem finding parts or filters. It uses a 30sqft Prefilter (18 months), a 5lb Granulated Activated Carbon filter (2 years), and a 54sqft H12/13 HyperHEPA (4 years). Now all this research brought me to the Swiss made IQAir HealthPro Plus. UV lights are also not necessary because HEPA filters will capture viruses. Anything else like BlueAirs “HEPAsilient” are NOT REAL HEPA! And ionizers/ozone generators should be avoided as they create ozone as a byproduct which is not good for you. Instead pay attention to CFM and the type/amount of filtration.Īlso make sure they are using true HEPA, H13 or better. You can ignore AHAM certifications and CADR ratings as these are misleading and there is a huge controversy over these rating systems as they are “pay to play” and are not an accurate measure of a units cleaning ability. But keep in mind that the general recommendation for whole house filtration is multiple units dispersed throughout. Generally you want a unit that can do atleast 250CFM. This is the amount of air the unit can move. In my research I have found that Cubic Feet per Minute (CFM) is the number that you should be paying attention to when comparing units. So I was determined to find one that wouldn’t off gas as well. Finally I discovered that most air purifiers on the market are constructed of materials that off gas, meaning they are emitting gases that they then have to try to clean, very counterproductive. I also wanted a long warranty with a reputation for reliability and high satisfaction. Carbon filters in most air purifiers are not substantial enough to be effective so I wanted to find one with a significant amount of granulated (pelletized) activated carbon, not just an impregnated sheet of it. So I set my goal on finding something with much longer filter replacement intervals. Most air purifiers with true HEPA filters will only last around 6 months before you need to replace the filter. The following is everything I've learned during this hunt so I apologize for the wall of text. I wanted something with outstanding particle filtration via true HEPA filters and I also wanted odor/chemical/VOC removal from granulated activated carbon. I was recently on the hunt for the best air purifier under $1,000 to buy for my new home.
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