In most cases, a single cut across the roll will produce a ready-to-use filter pad. A rugged polyurethane foam that is designed for use in room unit air conditioners and in pad-holding frames. It is washable and will withstand repeated cleaning with mild soap and water. Foam service rolls are available in 1/4", 1/2", 1" and 2" media thicknesses. Washable for repeat use.