21x21x4 MERV 8 Pleated Air Filter
- 21x21x4 MERV 8 filters made and manufactured by FilterBuy
- Actual Size 20.5x20.5x3.75"
- Traps and blocks over 90% of pollen, dust mites, mold, larger dust particles, and more.
- Ideal for standard and residential commercial use
- Designed to last 90 days. Replace regularly for optimum performance.
- Free shipping on all orders!