True Blue 36"x240"x1" MERV 4 Hammock Filter, made of fiberglass, effectively traps dust and lint. This frameless filter comes in a roll, allowing you to cut it to your desired size. With a lifespan of 1 month, it provides efficient filtration for residential, light industrial, and commercial applications. The roll measures 240 inches long, 30 inches wide, and approximately 1 inch thick.