Pad and Frame Air Filter (1 Frame and 6 Pads) - 12" x 30" x 3/4" Quantity:Default And there are no metal

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

The "Practical Pleat" contains over 500% greater surface area than a MERV 10 one-inch pleat

the "A+2000" brand Permanent Washable Electrostatic custom air filters are truly quality products

oxidation and deterioration

This design enables A+2000 custom air filters to maintain performance over the years

Pad and Frame Air Filter (1 Frame and 6 Pads) - 12" x 30" x 3/4" Quantity:Default And there are no metalIncludes one Frame and PACK of 6 pads The Pad and Frame Air Filter involves a permanent frame and replaceable filtration pad inserts. The permanent frame is constructed of space age plastics that are resistant to corrosion, oxidation and deterioration. Filtering inserts are anti microbial and are more efficient in capturing particles, such as dust, ragweed, pollen, etc., from the air stream, than standard fiberglass filters purchased at retail