Kam Ng | Acoustical Solutions

Kam Ng

Vice President of Engineering


Message Kam

  • Maryland

Evapco Fin Press Noise Evaluation


The Evapco Fin Press noise evaluation will determine if this industrial machine is in compliance with their hearing conservation program or if corrective measures are necessary. There is concern that the Fin Press operator’s noise exposure may be exceeding the OSHA Actin Level and the OSHA Permissible Exposure Limit.

A noise evaluation on the Fin Press provides the noise characteristics of the machine’s noise level. The measurements show the A-weighted sound pressure levels at the operator location peaks around 97 dB(A). The stamping action of the Fin Press is the major component to the noise that produces dominant frequency components at 200 Hz and 630 Hz. The Fin Press noise spreads out in an omni-directional pattern from the distributed noise source.

From the acoustic data, we generate a 3D computer model using a software called SoundPlan. This software provides high accuracy predictions, allowing us to evaluate various potential noise reduction scenarios. In this case, the most effective noise abatement measure is to surround the Finn Press with sound barrier acoustic blankets. Results from the noise model, as shown in the images above, indicate a 15.7 dB(A) reduction is attainable at the operator location. With the acoustic blankets, the 85 dB(A) goal as set by this study is possible. Noise measurement after the installation of acoustic blankets showed 16 dB(A) noise reduction, better than predicted.

Service Provided:

  • Attained detailed noise measurements around the Fin Press
  • Analyzed the data from measurements gathered
  • Created a noise model of the Fin Press to correlated with gathered measurements
  • Conducted predictive analysis of different treatment approaches
  • Collated findings and recommendations into a summary report
  • Deliverable report detailing measurements taken, analysis conducted and acoustic treatment recommendations

The objective of this project was to evaluate and characterize the sound field of the Fin Press. Based on the acoustical assessment and noise models, adding acoustical  treatment would be a solid approach to lowering the noise levels for the operator.

Specific Challenges:

The Fin Press was already installed and functional. There are not much acoustical treatments on the Fin Press except vibration mounts. The ceiling has no acoustic absorption panels and limited space due to moving crane above the Fin Press.

Client Details:

Evapco, Inc. offers an extensive selection of products for commercial HVAC, industrial refrigeration, power generation and industrial applications. This is the first unit of the Fin Press in use at the New Evapco Building. Two additional Fin Press will be installed in the future.

From the Client: “The rank and file in Key Building are very happy with the outcome.” – The Manufacturing Engineering Manager