Noise Reduction Blankets & Sound Curtain SystemsThese blankets are cut to 4′ width X custom length, or available in any custom size required (custom slits, holes patches, windows, strip curtains and more can more can be sewn in to your order). These blankets are grommetted across their tops and velcroed down both sides for interconnection. Boasting average 20 to 40+ decibel level drops, these self hanging blankets are suspended either from a ceiling or floor mounted frame.