I hate math like you do, but with a little math and a few hours of research you can do a great job choosing an air filter and cutting out the marketing junk. First, the government's CADR rating always has three levels, representing particles of different *size*. They call them dust, pollen, and smoke to represent large, medium, and tiny particles (of all kinds!). The smallest, "smoke," are tiny HEPA particles, like many allergens. Therefore, when purchasing a HEPA filter, you should only look at the Smoke CADR results. The second thing to know is that the government believes that people with severe allergies need to change the room air 4-5 times an hour and non-allergic people 2 times an hour to make it worthwhile. Anything lower and the particles might fall to the ground on their own, or you might just not feel the difference. (Once they fall, I recommend vacuuming with a HEPA filter like Miele). Your calculation involves an open door to another room, and the results are much better with the door closed, but you still need fresh air lest you be overwhelmed by the carbon dioxide imbalance, so leave the door slightly ajar. Finally, CADR is calculated. at maximum fan speed. NO ONE uses their air filter to the max, let's face it! In fact, my goal is to keep my air filter low because I know I can live with that with no issues. So start shopping now. Find brands that you trust or have heard good reviews from, visit their websites and download their manuals. There you will usually find the specified CADR and CFM performance at different fan speeds. If only one CFM is listed, it is for the maximum speed, so you can look at fan power consumption and calculate CFM proportionally for different speeds. For example, if the low power setting is 1/3 of maximum, you are likely to get 1/3 of the advertised CFM at low fan speed. Take the CFM output of Smoke listed in the manual and divide it into cubic feet. Her room. The Blue Air Classic 205 says the low fan speed delivers 75 cfm for smoke-sized particles. (Again, the size of the smoke is the HEPA particles that matter). My bedroom is 12 x 12 x 8 feet so I divide 75 CFM (low power) by (12*12*8) 1152 and I get about 15. That means it takes 15 minutes to clean the air. So I get 4 air changes per hour. Ideal! I never have to increase the fan speed above low. Using this method, I found the Rabbit Air completely useless in almost every setting. Of course people will say that low settings are quiet - it doesn't work at all. He needed such a small room that no one would live in. So be sure to use this formula and estimate or calculate the space you will be using it and the speed you will be using it. Do not be fooled! You may need to buy a larger air filter if you want lower speeds to be practical. Some brands are purely marketing and useless at low speeds. Finally, the filter change is usually done under the same rule of maximum fan speed and 24/7 usage. Blue Air says I have to replace it in 6 months. Since I work 12 hours a day (nights) at a low level, I can calculate the proportion. 75 CFM is 35% of the maximum 220 CFM setting, so running 24/7 means I won't change the filter for about 17 months. Since I will be running half a day, I will not change it for 35 months! Sounds right; If you google when HEPA filters need to be changed, they say they "usually" need to be changed every 3-5 years. Boom. Saved a fortune. So far the Blue Air works great and has a smooth, quiet sound. I give 5 stars if nothing goes wrong over time. hope this helps you Do your due diligence and good luck - Update: After a year it's working the same as when you bought it, so I've upgraded it to 5 stars. The application sometimes causes some problems. I don't like companies that force you to connect to the internet because they clean your data. I believe the EULA says they upload your data to their servers which probably means they end up in huge correlative databases and sell it to invisible third parties which is Silicon Valley's main business plan. For example, maybe people who live in Los Angeles, have their air filter on before bed, and have also recently bought fancy cheese are more likely to own a Tesla. This is how Google and Facebook work, as well as anyone who cleans your data. I can't be sure if Blue Air is really his famous companies out to break into your home (Google bought Nest for this reason). .
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