• Reducing unit-cooler noise amplified by reflections from panel walls
• Dispersing direct cold drafts and improving temperature uniformity
• Addressing workplace noise-exposure requirements under Korean occupational safety legislation

Noise amplification in a panel structure

In the enclosed sandwich-panel space, cooler noise reflected from walls and resonated, amplifying perceived noise to 86 dB and increasing hearing-related risks.

Strong direct cold drafts

The cooler’s strong discharge struck workers directly and reduced work efficiency.

Occupational safety and noise risks

Persistent high noise can contribute to occupational illness and requires workplace management under Korea’s Serious Accidents Punishment Act and Occupational Safety and Health Act. The existing system struggled to maintain the required noise conditions.

Fabric absorption of mechanical noise

The flexible, porous fabric acts as a silencer for high-frequency fan noise. Minimizing airflow friction inside the duct also reduced room resonance.

Distributed discharge to reduce airflow noise

Laser-cut holes spread air uniformly rather than releasing a strong jet in one direction. Lower air velocity reduced airflow-generated noise.

Permeable-surface condensation control

Permeable fabric prevented surface condensation in the humid food-processing environment, supporting hygiene management suited to HACCP processes.

Low-noise design for workplace safety

Duct length and discharge area were designed to reduce noise measured at workers’ ear height and support a safer working environment.

Substantial noise reduction

The fabric absorbed sharp mechanical and reflected noise, reducing overall workplace noise to 76 dB and allowing easier communication between workers.

Comfortable cooling

Uniform air distribution resolved 100% of worker complaints about direct cold drafts.

Minimal temperature variation

Uniform cool-air delivery reached previously underserved areas and maintained temperatures suited to preserving product freshness.