For a hearing loss of less than 20 dB, what vent size is typically used?

Using an open vent for hearing loss of less than 20 dB is ideal because it allows for better sound quality and maintains the natural hearing experience for those with mild or minimal hearing loss. The open vent design facilitates airflow and reduces the occlusion effect, which can occur when a hearing aid blocks the ear canal. This effect can cause the user to experience their own voice or internal sounds as too loud or distorted.

When venting is appropriate, such as in cases of mild hearing loss, having an open vent helps prevent a buildup of excessive sound pressure in the ear while still allowing some natural sound to enter, making the device more comfortable and effective. As a result, individuals can still perceive ambient sounds around them while benefiting from amplification where needed.

Other vent sizes, such as no vent, 3-4 mm, or 1-2 mm, might not provide the optimal balance of amplification and natural sound entry for those with mild hearing loss, who do not typically require significant sound amplification. Therefore, an open vent is the preferred choice in such scenarios.