Product Description You can cut this material with heavy shears or a razor knife to create almost any size 1 In. air filter for furnace and central air. It is springy, almost rigid and needs no frame for support. Just cut and install. Moreover, it can be washed and reused several times. It is the ideal replacement for hard to find or special filter sizes. From the Manufacturer You can cut this material with heavy shears or a razor knife to create almost any size 1 In. air filter for furnace and central air. It is springy, almost rigid and needs no frame for support. Just cut and install. Moreover, it can be washed and reused several times. It is the ideal replacement for hard to find or special filter sizes.