The main types of diffusers are:
- Passive diffusers - a diffuser that allows essential oils to be exposed to air so that the oils naturally evaporate and are dispersed into the air. Placing several drops of oil onto a tissue is one of the most simple methods of passive diffusion. Some of the more common commercial passive diffusers include terra cotta and ceramic diffusers.
- Fan diffusers - devices that use a small fan which creates airflow over a pad or wick with the essential oils to disperse oils into the air.
- Heat diffusers - heat diffusers, such as lamp rings, candle diffusers and electric heat diffusers, heat the essential oil to promote diffusion into the room.
- Mist diffusers - mix water and essential oils together which then enter the surrounding air.
- Nebulizers - nebulizers break the essential oils into tiny droplets.