Furnace Filter Whistle

Our furnace filter whistle easily attaches to a new furnace or air conditioner filter and sounds when your filter becomes 50% clogged, letting you know it is time to replace the filter. The furnace filter whistle is reusable. It is individually packaged with simple-to-use instructions or may be custom packaged with your logo, message or program theme. Minimum purchase quantity of 250 applies to the custom-packaged furnace filter whistles.