ResMed HumidAire 2i User Manual page 18

2. Fit the seal onto the rim of the water chamber base. Press along the edge to
ensure that the seal is fitted properly.
3. Fit the lid onto the water chamber base. Press the lid and base firmly
together to close.
4. To close the side catches see the illustrations below,
Note: If the side catches become detached from the water chamber base,
reattach them as shown.
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Rim
Seal
Lid