The Fisher and Paykel Diffuser filters fit in between the Diffuser Cover and the Elbow on all F&P Zest Q Masks. The diffuser will lower the sound level of any F&P Zest Q Series Mask by approximately 5 dBA
The Diffuser Filter and Elbow Cover are optional items which help to make the F&P Zest Q Masks extra quiet. They are not required for proper operation of the mask.
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