No ducting required with Ventless Installation, Reduce creasing with Wrinkle Block, ENERGY STAR(R) Electric Dryer, 24" compact size, Wrinkle block reduces creasing and wrinkle build-up for up to 2 hours after the end of a program. Wrinkle Block. The Wrinkle Block option reduces creasing and wrinkle build-up for up to 2 hours after the end of a program.