Merv 11 Pleated Air Filter - 17 1/2" x 17 1/2" x 1" Quantity:12-pack And there are no metal

And there are no metal parts that could lead to corrosion or oxidation within the filter

The "Practical Pleat" media is up to 28 times more effective at capturing particles than standard fiberglass panel filters

Finally they are factory made so you don‰۪t have to deal with the hassle of trying to cut and size your custom air filters and they come with a full warranty

the greater it's resistance to airflow

The Pad and Frame Air Filter involves a permanent frame and replaceable filtration pad inserts

Merv 11 Pleated Air Filter - 17 1/2" x 17 1/2" x 1" Quantity:12-pack And there are no metalAny Kind of Filter's Extended Surface Pleated Filters outperform ordinary furnace filters with medium efficiency and are designed for lower pressure drop, and long service life which reduces HVAC equipment maintenance and energy costs. A higher MERV rating means that the air filter that you are about to purchase possesses a higher amount impurity filtration ability than your ordinary filter.