Resmed has requested for the mask to be returned so that an engineering investigation can be performed.The mask has not been returned, therefore, resmed is unable to confirm the alleged malfunction at this time.The airfit f20 user guide provides daily/after each use and weekly cleaning and maintenance instructions.The troubleshooting section also provides solutions for potential problems such as blocked or dirty vent, and wet vent.The user guide also provides the following warning: - ¿if any visible deterioration of a system component is apparent (cracking, crazing, tears etc), the component should be discarded and replaced¿.It also warns to ¿discontinue using this mask if you have any adverse reaction to the use of the mask, and consult your physician or sleep therapist¿.Resmed includes the following statement in the airfit f20 user guide ¿ ¿the elbow, valve and vent assembly have specific safety functions.The mask should not be worn if the valve is damaged as it will not be able to perform its safety function.The elbow should be replaced if the valve is damaged, distorted or torn.The vent holes and valve should be kept clear.¿ resmed reference#: pr (b)(4).
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