A composting apparatus including an electric motor driven drum. The drum is provided with spaced fins on the inner surface and a supporting shaft that can include air holes to provide air within the confines of the drum. In this instance, tubes with holes are secured inside the drum and communicate with a source of air so that air passes into the tubes, and thus into the pile of composting material. The drum is provided with a sliding door that closes an opening in the drum. The door is secured at its ends for movement within a grooved mount attached onto a surface of the drum. The door is moved along a surface of the drum to open the door. The door can be held in position with a small opening or to a full open position, thus opening the entire opening in the surface of the drum.