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Below is an example of how the sound outlet, relief
vent and microphone opening may be positioned in a
hearing 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
