Applications and Case Histories

This fiberglass composite is used in a diesel engine compartment located in the rear of a large motorhome. In addition to the noise reduction, the design engineers were pleased to have the heat barrier and fire protection that the noise blankets offered. These blankets are usually between 1" and 2" thick and have sewn perimeter edges as well as sewn penetrations.

This unit has all the necessary design features to make an exceptional noise enclosure:

1. Light tight doors and air baffles.
2. Belly pan.
3. Acoustical foam (1" thick with protective facing) that lines all the hard reflective surfaces inside the metal enclosure.
4. 16ga. or heavier metal fabrication for the enclosure skin.

Most front engine vehicles can have a significant reduction in noise that is transmitted through the fire wall by applying a decoupled barrier (1# per square foot) on the cabin side. Care should be taken that all penetrations are sealed so noise cannot "sneak" into the interior.

Embossed faced acoustical foam with damping was added to the inside of this speaker housing to eliminate the "tin can" echo that people heard on the outside. These units are used outside in fast food drive through order stations.

A manufacturer of hotel ice making machines requested a fast prototype noise kit made of 1/2" thick embossed faced foam. Drawings were sent to dB Engineering by email and the parts were cut on a water jet table the next day. These parts were attached to the inside of the compressor housing using PSA (pressure sensitive adhesive). Significant noise reduction occurred at 1000 Hz and higher frequency bands.

Table showing how the human ear perceives noise reduction.

Cab Insulation | Noise Curtains | Vibration Control