Practical Pleated Air Filter (2-Pack) - 23 3/4" x 23 3/4" x 5" Quantity:Default Either way

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these can be purchased in any conceivable size

28X Increased Efficiency

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) - 23 3/4" x 23 3/4" 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