Air Filter Whistle
A clogged or dirty furnace filter can rob your furnace of energy efficiency. The Furnace Filter Whistle easily attaches to a new furnace 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.
- Whistle alerts you to change filter
- Helps improve HVAC efficiency
- Fits all 1” filters