Merv 8 Pleated Air Filter - 13 1/2" x 22" 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

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

Either way

and the greater the pressure drop it creates

They are easy to install with custom air filters made to the sizes that you specify

Merv 8 Pleated Air Filter - 13 1/2" x 22" 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.