Air Filter Alert

Never forget to change your furnace air filter again!

Your furnace air filter can collect enough pollen, dust, dander and other impurities to impede airflow, reduce indoor air quality, and raise your heating bill. Our monitor measures how much air flows through your furnace's return vent and emits a warning tone when the it's time to replace the filter. Two AA batteries included. Imported.

Makes a great gift for dad or the person who has everything.