Abstract: This device is used for the drying of vegetative matter for human ingestion. This device is designed to create a closed environment in which the user can fine tune the operation depending on what is being dried, and also provide the ability to manage any odors generated by the process. The user harvests the herbs in question and hangs them inside the drying chamber. The device is called a ‘Passive Ventilation Psychrometer’ because it contains no air moving mechanism. The user has to install and establish an exhaust system for evacuating the air within the device. The user is also responsible for setting up the intake air, which gives said user some control over the temperature and humidity of the incoming air. The user also sets up the hydration chamber to control humidity up or down, depending on ambient conditions.