- Pack of 12 disposable UL Class II rated air filters designed for protection of furnace and central air units
- MERV 4 rating: Removes household dust, pollen, and lint
- Continuous chipboard design guards against corner separation while the one-sided metal media retainer adds to the filter strength
- Each filter maintains efficiency for up to 30 days
- Compatible with HVAC systems requiring filters sized 20" x 30" x 1"