Auto Draft Stove Blower AD-1Fits Most Wood or Coal Burning Stoves The Auto Draft can be installed on any wood or coal burning stove pipe 5" to 8" in diameter. It is designed to solve draft problems without increasing the height or diameter of the chimney. With the Auto Draft your hard starting stove draws immediately. No smoky back up even with moist or hard to ignite types of wood. Once the fire is burning, adjust the variable speed control knob on the electrical box to achieve