These filters slide in between the Diffuser Cover and the Elbow on all F&P Zest Q and F&P Lady Zest Q CPAP Masks. When in place the diffuser will lower the sound level of any F&P Zest Series Mask by approximately 5 dBA. The filter is placed under the plastic cover located on the elbow. The filter assists in ensuring the mask is super quiet and minimizes exhalation draft.
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