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Perforated Metal in Acoustics

Perforated metal is the primary component in the manufacturing of noise control systems and noise control products. When perforated metal is used as a decorative cover or as protection for an acoustical material, the sound waves travel right through the “transparent” metal to the material underneath that reflects, scatters or absorbs sound in a certain way. Choosing the best metal that allows for greatest sound transparency is the goal. To do this, Hendrick professionals consider the metal gauge, hole size, amount of open area and sheet thickness that work best in each particular application for perforated metal sound absorbing panels.

Perforated metal can also be used as a resonant sound absorber, which means that it acts to decrease or eliminate sounds in a narrow frequency range. In this case, the holes are designed to control air motion in response to specific frequencies. Here, the perforated metal is not “transparent,” but assumes an active role in concentrating the absorbed sounds into a specified frequency range. We can provide noise abatement metal solutions for even the most complex acoustical challenges in a variety of perforated patterns.

Perforated Metal in Noise Control

Noise control — in the form of perforated metal acoustic wall panels and perforated metal acoustic ceiling panels — helps to make human environments safer and more comfortable. Excess noise is not just unpleasant; it can damage hearing and increase stress levels as well as hypertension. Acoustical panels made from perforated metal absorb sound waves, reducing noise, making work and living environments more pleasant, and helping to safeguard our hearing and overall health.

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Industrial Noise Control Products and Applications

Our products include:

  • General enclosures
  • Double wall/HVAC
  • Silencers
  • Baffles
  • Speaker grilles
  • Ceiling panels
  • Wall panel systems
  • Highway panel systems
  • Sound rooms
  • Music rooms
  • Concert halls
  • Gymnasiums
  • Hearing test rooms


  • High sound level isolation
  • Acoustical enhancement
  • Provides EMI shielding
  • Aesthetically appealing
  • Reduced weight

Material and Design Options

The following factors are important when it comes to acoustical applications:

  • Materials
    Common materials used for perforated metal speaker grills and other products include stainless steel, aluminum, Inconel and titanium alloys.
  • Hole Shapes, Sizes and Patterns
    While a staggered pattern of round holes is generally used, other shapes and patterns are preferred for some applications. Smaller hole sizes are better for noise control than larger sizes.
  • Metal Shape
    Bent or corrugated metal works better than flat metal sheeting. These shapes not only control noise, but they offer visual interest, too.  
  • Perforation Patterns

Why Hendrick?

Hendrick has 140+ years of experience in industrial noise control methods. Our engineering noise control capabilities allow us to provide metal solutions for the transportation, manufacturing, appliance, interior environment (HVAC), hospitality and music industries. Customers around the world count on Hendrick for help in evaluating their application and creating the best acoustical solution for their unique needs. And we can help you, too!

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