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  1. An acapella is a small, handheld device that helps clear mucus from the lungs using positive expiratory pressure (PEP). It has similar characteristics and indications as a flutter valve but uses a different mechanism to create backpressure and oscillations.
    www.respiratorytherapyzone.com/acapella-flutter-v…
    Acapella devices are similar to flutter valves in that they create PEP and vibrations when you exhale into them. However, rather than being shaped like a pipe, they are shaped like a cone. Plus, they are not gravity-dependent. For this reason, they can be used in pretty much any position. 1
    copd.net/clinical/flutter-valves-acapellas
    The Acapella Valve is a unique handheld device that keeps your lungs clear of mucus so you can breathe easy. It combines the benefits of positive expiratory pressure or PEP therapy with airway vibrations.
    justnebulizers.com/blogs/respiratory-blog/acapella …
     
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  3. Flutter Valve vs. Acapella: PEP Therapy Devices (2025)

     
  4. How Do You Use a Flutter Valve or Acapella? - COPD.net