What is the air filter for the S9/Air Sense 10?

Air Filter/Filter

There are two types of air filter for S9/Air Sense 10: Standard and Hypoallergenic.

Standard air filter:

Material: Polyester non woven fibre.
Efficiency: >75% for ∼7 micron dust.

Hypoallergenic air filter:

Material: Acrylic and polypropylene fibres in a polypropylene carrier
Efficiency: >98% for ∼7 to 8 micron dust.   Efficiency: >80% for ∼0.5 micron dust.

Left: Standard air filter,   Right: Hypoallergenic air filter

Below is the part number the Air Filter