Furnace Filter Whistle
Our 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. Individually packaged with simple use instructions.
| Specifications | Approximately 2" in diameter. |
|---|---|
| Features | Promotes Better Energy Efficiency. |
Keep the heat inside!
• Winterize your home • Save energy • Stay alert when filter needs changing
