Sonic Horns to Keep Dry Bulk Material Flowing

AcoustiClean Sonic Horns are designed to produce low frequency, high volume sound vibrations to prevent costly material build-up in hoppers, bins, silos, boilers, ESP, SCR, fans, etc. The sound waves produced by applying 70-90 PSI of compressed air at a volume of 40-80 CFM to the sound generator, vibrates a high strength titanium diaphragm, which induces dry bulk material back into the flow stream. The size and shape of the horn’s bell section determines the acoustic energy produced. A longer horn with a larger bell section will produce more energy and clean a larger area.


  • EASE OF INSTALLATION – Can be mounted outside vessel or hung inside
  • CAST IRON OR STAINLESS STEEL CONSTRUCTION – Can operate in high heat and/or food process
  • LOW OPERATING COST – 70-90 PSI / 40-80 CFM air consumption
  • LOW MAINTENANCE – Titanium Diaphragm is only moving part – easy to replace
  • FEWER UNSCHEDULED SHUT DOWNS FOR CLEANING – Improved process efficiency & productivity

Recommendations for Successful Installation

  • Vessel must be clean and free of deposits.  A sonic horn will not clean a dirty vessel with material stuck to the sidewalls.  It will facilitate material flow from a clean vessel.
  • The material must be relatively dry and powdery.  Sonic horns are typically not effective if the moisture content is above 25%.  The best alternative is an Airsweep System.
  • Compressed air must be clean and dry.  Pressure and volume must be maintained at 70-90 PSI / 40-80 CFM to ensure horns are able to emit sound efficiently.
  • Recommended starting point for sounding a horn is 10 seconds in duration every 10 minutes.  Sounding a horn longer than 10 seconds may over-stress the diaphragm and cause it to break prematurely.  Users with flow issues in very large vessels may want to consider installing Airsweep Systems at the bottom of the vessel and sonic horns at the top to ensure the best possible flow.
  • On boilers, the most effective installation will have the horn(s) blowing in the same direction as the pipes, where the acoustics can get between the pipes and the wall of the boiler. i.e. end-to-end.  Sounding the horn behind pipes on one side of the boiler toward the pipes on the other side will generally not produce effective results.