Without air, the aerobic organisms that are important for composting will die. To increase the air circulation, loose dry additives such as sawdust should be added frequently. Turning, or mixing, of the compost allows for vapors and gasses to be released. For example, at CCAT, they throw in a coffee can of sawdust each use and turn the compost once a month. Ventilation You can use grates, screens, and mesh in the design of your composting chamber to support the compost and increase its exposed surface.
Electric fans can help draw air into the system and direct it to the outside.
Ventilation chimneys help with odor control and should have as few bends as possible to help in this process. Care must be taken so that enough heat is retained in this process, as it is important in composting. As Figure 1 shows, temperature increases the rate of decomposition. The higher the temperature, the faster the material decomposes. There are many ways to increase temperature.