Change the air filter. Replace at least every 6 months. It cannot be washed.
Check and replace it more often if there are any holes or blockages caused by dirt or dust.
To change the air filter:
1. Slide the air filter cover off and remove the old air filter.
2. Insert a new air filter and replace the air filter cover.

Material: Polyester non woven fiber. Average arrestance: >75% for ~7 micron dust.

Hypoallergenic: Material: Acrylic and polypropylene fibers in a polypropylene carrier
Efficiency: >98% for ~7-8 micron dust; >80% for ~0.5 micron dust

Note:
• Make sure the air filter cover is fitted at all times to prevent water
and dust from entering the machine.
• The use of ResMed approved hypoallergenic filter will result in a
small reduction in the accuracy of the delivered pressure at high
leaks.