We live in Arizona and have 2 furnace/air conditioners mounted on the rafters as usual here. In the corridors there are air ducts connected to 2 louvered grille covers equipped with filters. I have these replacements for her. They are lightweight and easy to install. Simply remove and discard the old ones, slide them back into place and close the metal bars. One thing to keep in mind is that most filters I've used in the past are 1 inch thick. It's 2 inches. It seems to me that due to the larger size of the folds, they are better at filtering out pollutants for longer. Just measure the distance before ordering so you know the width will fit your metal caps. They are made in the USA.
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