Comment by dusted

excellent write.. I bought multiple of these airfilters after reading that review, because, honestly, I didn't believe it anyway, and my particle sensors clearly show when the filter is running.

Unfortunately, the build quality is not exceptional, so there is a bit of noise from the unit, even at the low settings, but placed far enough from the bed, it's hard to notice. The particle count is higher during the night, but not as high as with the filter completely turned off. I can even see when my sleep is interrupted, and when I go to bed and wake up from the particle count graph.

I must admit that I capture the data with the ikea "VINDRIKTNING" sensor, it has a TX pin exposed and that is easily hooked to RX on an ESP8265, which simply runs a TCP socket server that streams the reading via wifi.