Slide latch release to open door, remove crucible and load with material (if using concentrates, insert pad first). For dry herb, grind to a medium, coarse consistency and load crucible loosely, level to the top. Do not pack; packing will prevent airflow. Tamping the herb down is not necessary.
Fit crucible lid securely and return to the unit ensuring there are no gaps between the lid and crucible as you close the door.