Atypical noise hoods

Atypical noise hoods have unusual shaping arrangement, they are so-called “hoods made-to-measure”.
They are intended for being built into segmented spaces where standard noise hoods cannot be used. A majority of our hoods are designed in cooperation with our purchasers, these hoods, however, require a close collaboration with designers or masters in the production.
Atypical noise hoods are designed in the following stages:
Analysis of the noise problem
Proposal and development of the solution
Production and installation of noise-damping measures
Evaluation of efficiency of noise-damping measures

Characteristic of the hood:

(length x width x height):
according to the requirements of the customer
noise attenuation: from 9 to 25 dB
wall thickness: min. 50mm
type of construction: -usually demountable hood – acoustic panels attached to the supporting frame, supporting structure with removable acoustic panels
  - in some cases noise-damping material is applied to the existing structure
construction of acoustic panels: sandwich version

external covering with steel, aluminium or stainless steel sheets of the thickness 1,5 mm, or 2 mm for robust panels
panels of the mass over 40 kg are provided with loops for being handled by a crane

surface finishing: according to the requirements of the customer
possible accessories: ventilation units
  acoustic labyrinth for ventilation air inlet
  electrical wiring
  cable bushings
  anti-noise door, gate
  anti-noise windows
Atypical noise hoods

 (taken from Center of environmental hygiene of State Health Institute Prague)

Noise is every unwanted sound that is disturbing or troublesome or that affects adversely human health. Negative effects of noise on human health are partly specific ones, presented by disorders of the function of acoustic analyzer, partly non-specific ones (extra hearing), when functions of various systems of the organism are affected. These non-specific system effects appear almost in the whole range of noise intensities, frequently they are accompanied by stress reaction and impact on neurohumoral a neurovegetative regulation, biochemical reactions, sleep, higher nervous functions, such as learning and memory, impact on sensory motoric functions and coordination.


RNDr. B. Madejewski,CSc., Ing. V. Kotrba, CSc.

The article describes the design, calculation and test results noise attenuation of the noise hood for large industrial compressors driven by electric motors. Predicted noise attenuation (software UTLUM) has been validated by practical measurements at the customer¢s place.