I am sadly disappointed that you no longer offer the 411 air filter; I already have two and wanted another.
I ordered the 311and discovered I can’t use it because of the radio/microwave additions. I turned off the WiFi, but something else is causing emissions; perhaps the particle detector?
I have a lung condition and am very sensitive to not only smoggy air, but also radio/microwave emissions. I really wish you would bring back the 411; it is a perfect, simple, well functioning device that has literally helped save my life, especially during the wild fires we have here frequently. When you stop providing filters for the 411, I don’t know what I will do.
Theirrie Cook