Merv 8 Pleated Air Filter - 21 1/2" x 24 1/4" 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

In general

from the air stream

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

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Merv 8 Pleated Air Filter - 21 1/2" x 24 1/4" 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.