Merv 11 Pleated Air Filter - 21" x 24" 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

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

such as dust

This is a 5" MERV 10 HIGH PERFORMANCE AIR FILTER

Merv 11 Pleated Air Filter - 21" x 24" 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.