Aqua-Flos premiere air filteration pads can be cut with quality shears or a utility knife to create almost any size one- inch air filter for furnace and central air conditioning units. The product is semi-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. These are a money saving product, not only in their ability to be reused, but allow the correct air flow to put the least amount of strain on your componets motor, thus reducing wear, and lowering energy consumption.