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Hearing Device Filters

The Donaldson® d-Guard™ is an acoustically transparent filter that protects microphones and can easily be press-fit or assembled into BTE hearing aids as a standard part. It protects the device’s microphone from contaminants such as dirt, dust, hair spray, oils, perspiration, and water so that ambient sound can still be heard, even when the device has been exposed to these contaminants.

The d-Guard™ hearing device filter improves reliability and helps to extend the life of the microphone by keeping it clean. The d-Guard™ filter fits seamlessly into existing hearing aids. There are no sealing materials or adhesives required allowing the filter to blend into the device unnoticed.   

  • Fits a standard microphone opening of 2.44 mm / .096 in
  • Applied to Behind the Ear (BTE) hearing aids
  • Press-fits into place
  • Reduces wind noise
  • Inhibits ingress of cerumen
  • Protects from water ingress
  • Precision die cut and over-molded product
  • Filter material comes in either white or black