The Z1™ Heat Moisture Exchange (HME) is an inline humidification solution unit for use with the Z1 & Z2. It is a waterless humidification that requires no additional power and takes up very little space. A great alternative to large humidifiers.
 
When using your CPAP or BiPAP the HME Filter captures heat and moisture from the air as you exhale. It then returns heat and moisture to the breathing circuit with each inhalation creating a comfortable, effective and convenient humidified breathing system.