Practical Pleated Air Filter (2-Pack) - 18" x 21" x 5" Quantity:Default than standard fiberglass filters purchased

than standard fiberglass filters purchased at retail outlets

such as dust

degrade and restrict air flow

They are easy to clean by simply backwashing every month with cold water so you don‰۪t need expensive cleaners

from the air stream

Practical Pleated Air Filter (2-Pack) - 18" x 21" x 5" Quantity:Default than standard fiberglass filters purchasedYes, 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