Filtrete
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3M's HVAC air filter tells you when it needs replacing
As people get more concerned about the air they're breathing, so the case for buying a smart air purifier becomes more pressing. That's what has prompted 3M to build the Filtrete Bluetooth-enabled residential air filter, which lets you know when it's time for a change. The idea being that the filter itself can alert you — via an app for your smartphone — when it's time to run to the store and buy a $30-ish replacement.
