Perforated Acoustic Panels and Slotted Perforated Metal Sheets for Wall Cladding, Ceilings and Noise Control

Perforated acoustic panels are engineered metal panel systems made from perforated sheets combined with acoustic lining materials such as mineral wool, rock wool, glass wool or acoustic fabric. These panels are widely used for sound absorbing walls, acoustic ceilings, decorative wall cladding, transportation hubs, factories, offices, auditoriums, commercial buildings and highway noise-control systems.

As a manufacturer, Hengda supplies perforated acoustic panels in aluminum, galvanized steel, mild steel and stainless steel. The panels can be customized by perforation pattern, hole size, open area, sheet thickness, edge profile, frame structure, lining material, color finish and installation method.

1. Product Materials and Acoustic Panel Structure

Perforated acoustic panels normally include three main layers: the front perforated metal sheet, the acoustic absorption lining and the rear supporting structure. The perforated metal surface provides strength, decorative appearance and impact resistance, while the acoustic lining absorbs sound energy passing through the holes.

• Panel Material: Aluminum, galvanized steel, stainless steel, mild steel

• Perforation Patterns: Round hole, square hole, slotted hole, decorative hole

• Lining Materials: Mineral wool, rock wool, glass wool, acoustic fabric

• Surface Finish: Powder coating, PVDF coating, polyester coating, galvanized finish, brushed stainless steel

• Common Colors: White RAL 9010, White RAL 9016, grey, cream, black and customized colors

According to acoustic metal panel design references, perforated metal panels work by allowing sound waves to pass through the perforations and enter the absorptive backing material. This structure helps reduce reverberation and improves indoor sound comfort.

Reference:
AcousPlan – What Are Perforated Acoustic Panels

2. Acoustic Performance and Sound Absorption Principle

The sound absorption performance of perforated acoustic panels depends on hole size, open area percentage, cavity depth, panel thickness and the acoustic material installed behind the metal facing. In general, higher open area allows more sound energy to enter the absorption layer, while smaller perforations can improve mid-to-high frequency absorption.

Perforated metal acoustic systems are commonly used to control reverberant noise in airports, railway stations, metro stations, factories, offices, auditoriums and public buildings.

Reference:
Kinetics Noise Control – Perforated Metal Sound Absorbing Panels

3. Technical Specifications for Perforated Acoustic Panels

Hengda supplies customized perforated acoustic panel products according to project noise-control and architectural requirements.

• Panel Materials: Aluminum, galvanized steel, stainless steel, mild steel

• Perforations: Round, square, slotted and decorative patterns

• Typical Thickness: 0.5 mm to 3.0 mm for acoustic wall and ceiling panels

• Open Area: Customized according to sound absorption and ventilation requirements

• Lining: Mineral wool, rock wool, glass wool or acoustic fabric

Acoustic metal ceiling products often use perforated metal combined with fleece or mineral wool backing. Technical references show that perforated metal acoustic panels can commonly reach NRC ranges around 0.50 to 0.75 depending on perforation design, backing material and air cavity configuration.

Reference:
AcousPlan – Acoustic Metal Panel NRC Reference

4. Installation Methods for Acoustic Wall and Ceiling Panels

Different projects require different mounting methods. Hengda supplies perforated acoustic panels with four common installation systems.

• Surface Mounted

• Suspended

• Ceiling Infill

• Clip On

Surface-mounted perforated acoustic panels are suitable for walls, tunnels, factories and renovation projects. Suspended acoustic ceilings are widely used in airports, stations, offices and commercial interiors.

5. Slotted Perforated Sheet for Acoustic, Ventilation and Screening Applications

Slotted perforated sheet is a precision metal plate punched with long rectangular or oblong openings arranged in straight or staggered patterns. Compared with round holes, slotted holes can provide greater directional flow, higher drainage capacity and better open area efficiency in specific applications.

• Common Slot Size: 0.5 mm × 5 mm to 10 mm × 50 mm

• Sheet Thickness: 0.5 mm to 6.0 mm

• Materials: Mild steel, galvanized steel, stainless steel 304, stainless steel 316, aluminum 1060, aluminum 6061

Reference:
Slotted Hole Perforated Sheet Specification Reference

6. Typical Slotted Perforated Sheet Specifications

• 12 Gauge, 16 Gauge, 18 Gauge, 20 Gauge, 22 Gauge, 26 Gauge

• 3.175 × 25.400 mm oblong slot

• 6.350 mm centers

• 43% open area

• 22 gauge steel available

Another common slotted perforated metal option uses 6.350 × 38.100 mm slots with approximately 67% open area.

These high open area slot patterns are suitable for ventilation grilles, industrial drying trays, speaker panels, acoustic ceilings and drainage screens.

7. Applications of Perforated Acoustic Panels

• Airport acoustic ceilings

• Railway station wall cladding

• Metro station ceilings

• Factory noise-control walls

• Office acoustic ceilings

• Auditorium wall panels

• Commercial building interiors

• Highway noise barriers

In HVAC and building systems, perforated panels should also be selected according to airflow, pressure drop and installation structure. SMACNA technical standards are widely used as references for sheet metal and HVAC construction.

Reference:
SMACNA Technical Standards for Sheet Metal and HVAC Construction

8. Benefits of Perforated Stainless Steel and Aluminum Acoustic Panels

• Effective sound absorption

• Excellent corrosion resistance

• Easy maintenance

• Long service life

• High mechanical strength

• Custom perforation sizes available

Aluminum acoustic panels are lightweight and suitable for ceiling systems and large wall cladding projects. Stainless steel acoustic panels are ideal for humid or corrosive environments.

9. Conclusion

Perforated acoustic panels and slotted perforated metal sheets provide an ideal combination of sound absorption, ventilation, durability and architectural decoration. With customized perforation patterns, open area ratios, acoustic linings and mounting systems, these panels are widely used in airports, stations, factories, offices and commercial buildings worldwide.

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