The ResMed HumidX F20 for AirMini 6-Pack accessory provides waterless and unpowered humidification to your sleep therapy at home or on the go. This accessory provides more heat and moisture than the standard version and is more appropriate if you require more humidity or are using your Airmini in drier locations/seasons. HumidX uses heat and moisture exchangers to retain humidity from the air that you’re breathing to improve your PAP device therapy.
Please note: The HumidX™ F20 for Airmini™ is only compatible with the F20 Full-Face Mask. This accessory is not compatible with P10 Nasal Pillows, N20 Nasal Mask, or N30 Nasal Masks.
I know that it is confusing that the product picture shows x3. I did get an x6 box for my AirMini. I find the AirMini great for travel with its smaller size and the convenience of not having to look for distilled water. The Humid helps/ reduces my mouth getting completely dry without the distilled water.