I bought this a day before workers did some drywall work in the house. As soon as they laid out their protective rug, the display air quality indicator went from 5 to over 100! It was just dust in their rug and their work hasnβt even started yet. This tells me how accurate it is. I had it on full power while work was being done, canβt even imagine the dust and bad air quality without this purifier. Even when I cook the indicator shows a change. My other air purifiers donβt have this indicator, I think I will get one for the other rooms as well. Itβs my favorite one so far! Also I love that I can control it from my phone. Highly recommend! Read more
This InvisiClean air purifier looks and feels fine. Its functions are well-described in its webpage, so I am not going to discuss them in this review. Its 1500-square-foot claim is totally unrealistic. The way air purifiers work is quite simple. HEPA air purifiers work by sucking the air from the room through their internal filters, thus blocking unwanted particles, and then blowing the purified air back into the room. Size matters in the world of air purifiers. Therefore, when it comes to HEPA filters, the bigger the fans and filters, the better their performance. This air purifier is too small to efficiently cover 1500 ft2. A U.S. government website provides the formula on how to calculate the coverage of an air purifier based on its CADR. It shows that CADR should be at least two-thirds of the roomβs area in square feet for 8-foot-tall rooms: β’ CADR = (Room Size x 2) / 3 Room Size = (CADR x 3) /2 According to this website, the room coverage for this purifier is: (200 x 3) /2 = 300. Therefore, to be able to filter out allergens and dust thoroughly, this air purifier should not be used for rooms larger than 300 square feet. Its claimed coverage area of 1500 square feet is FIVE times more than the recommended value by a U.S. government website. Here are more details showing clearly that the coverage area of this air purifier is inflated: Here are the specifications of this InvisiClean air purifier: - Weight: 9 pounds - Dimensions: 9"D x 9"W x 22.24"H - Shape: rectangle - Rated Power: 50 watts (from its user manual and webpage), 45 watts (under βSpecificationsβ) - CADR: 200 CFM - Voltage: 100-220 volts - Coverage: 1500 ft2 - Filter Dimensions (Cylinder): 11.5 inches H x 7.0 inches (Diameter) (measurements include frame) - Filter interface surface: (2Ο x radius) x 11.5β = 252.77 inches2 Here are the specifications of an air purifier similar to several ones I owned before, designed by an American company, available on Amazon: - Weight: 21 pounds - Dimensions: 18βD x 18βW x 19βH - Shape: Cylinder - Rated Power: 170 watts - CADR: 250 CFM - Voltage: 120 volts - Coverage: 390 ft2 - Filter Dimensions (Cylinder): 9.9ββH x 14.2β Diameter (measurements include frame) - Filter Interface Surface: (2Ο x radius) x 9.9β = 441 inches2 This InvisiClean air purifier weighs 2.33 times less, is 3.4 times less powerful, and its filter has an interface surface 1.74 times smaller. Yet it claims its coverage to be 5.84 times larger than the one designed by a respectable and renowned American company. How can a 50-watt purifier produce a 200-CFM CADR while a 170-watt purifier, using 3.4 times more power, can only generate a 250-CFM CADR, which is only 1.25 times more? It does not sound right. The AHAM (Association of Home Appliance Manufacturers) is the main organization that establishes and supervises CADR testing. Independent testing organizations should determine the CADR and CFM to ensure accurate, unbiased, and reliable results; therefore, did the manufacturerβs own test department come up with 200 CFM or did it come from an independent testing organization? On the label at the bottom of this air purifier, it only shows the ETL (Electrical Testing Laboratories) certification, which certifies that this product complies with necessary safety standards required by North American safety regulation. Please note that ETL does not certify CADR value. As I mentioned earlier, the AHAM (Association of Home Appliance Manufacturers) is the main organization that establishes and supervises CADR testing. On its webpage, it also claims certifications from CARB (California Air Resources Board) and FCC (Federal Communications Commission). his air purifier might be very enough for much smaller rooms, much smaller than its "1500 ft2" claim. Most people do not have other air purifiers to compare with or do not have time to research thoroughly; therefore, it is difficult for them to realize that the coverage area claim for this air purifier is quite exaggerated. Read more
