Practical Pleated Air Filter (2-Pack) - 21 1/2" x 21 1/2" x 5" Quantity:Default Either way

Either way

so it can provide a lifetime of dependable service

Can be ordered in packages of 2 each only

the more efficient a filter is at removing particles

and the greater the pressure drop it creates

Practical Pleated Air Filter (2-Pack) - 21 1/2" x 21 1/2" x 5" Quantity:Default Either wayYes, we even have the odd sizes! The "Practical Pleat" media is up to 28 times more effective at capturing particles than standard fiberglass panel filters. In general, the more efficient a filter is at removing particles, the greater it's resistance to airflow, and the greater the pressure drop it creates. One way to overcome this problem is to increase the surface area of the filter media. The "Practical Pleat" contains over 500% greater surface