These filters slot in between the Diffuser Cover and the Elbow on all F&P Zest Q and F&P Lady Zest Q CPAP/BiPAP Masks. When in place the diffuser will lower the sound level of any F&P Zest Q Series Mask by approximately 5 dBA!

USAGE: The Diffuser Filter and Elbow Cover are optional items which help to make the F&P Zest Q and the F&P Lady Zest Q Masks extra quiet. They are not required for proper operation of the mask.