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Below is an example of how the sound outlet, relief vent
and microphone opening may be positioned in a hear-
ing aid provided with a short vent and a full length vent,
respectively.
1. Sound outlet
2. Relief vent
(short)
3. Microphone opening
1. Sound outlet
2. Relief vent
(full length, outlet)
3. Relief vent
(full length, inlet)
4. Microphone opening