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Can I swap the cushions between the P30i and the N30i masks, but still use the same frame?

The frames on the P30i and N30i are interchangeable, the cushion locks are the same size.

The P30i comes with:

• Standard size includes: Small, Medium and Large Cushions
• Small size includes: Small and Medium Cushions

The small starter pack is generally recommended for females as it has the smaller size frame and the standard starter pack is generally recommended for males as the frame is slightly larger.

See the AirFit P30i product page

The N30i comes with:

• Standard size includes:  Small, Small/Wide and Medium cushions. The Standard mask comes with a Standard headgear and frame.
• Small size includes: Small, Small/Wide and Medium cushions. But the Small mask comes with a Small headgear and frame.

See the AirFit N30i product page