21x21x4 MERV 11 Pleated Air Filter
- 21x21x4 MERV 11 filters made and manufactured by FilterBuy
- Actual Size 20.5x20.5x3.75"
- Attracts and captures pet dander, lint, dust, pollen, dust mite debris, mold spores, smoke, and smog.
- Ideal for standard and residential commercial use
- Designed to last 90 days. Replace regularly for optimum performance.
- Free shipping on all orders!