Practical Pleated Air Filter (2-Pack) - 28" x 34" x 5" Quantity:Default The permanent frame is constructed

The permanent frame is constructed of space-age plastics that are resistant to corrosion

To find the size the old unit should have sizing information printed on it

PACK of 6 pads for Pad and Frame Air Filters

You may know them as washable air or even permanent air filters

Any Kind of Filter's Extended Surface Pleated Filters outperform ordinary furnace filters with medium efficiency and are designed for lower pressure drop

Practical Pleated Air Filter (2-Pack) - 28" x 34" x 5" Quantity:Default The permanent frame is constructedYes, 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