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Large supply and return ducts often run above public corridors in hospitals, schools, and office buildings. As airflow velocity increases during occupancy peaks, duct turbulence excites the sheet metal walls, producing duct breakout noise. This noise radiates into hallways and adjacent rooms, creating a constant mechanical hum.
Measurements in untreated corridor systems frequently range between 60–68 dB(A) during high airflow periods. In facilities where recommended corridor background levels should remain near 45–50 dB(A), this represents a substantial acoustic problem. Staff communication becomes more difficult, and in healthcare environments, noise can travel into patient rooms.
Standard duct wrap insulation does not significantly reduce airborne transmission. Without additional surface mass, ducts continue radiating mid-frequency noise into occupied areas.
The DuctaSil® B10LAG™ II Pipe & Duct Barrier System provides advanced commercial duct noise control by adding both mass and absorption directly to duct exteriors. The mass-loaded vinyl layer blocks airborne transmission, while the quilted fiberglass insulation dampens vibration. This combination typically reduces breakout noise by 10–18 dB, bringing corridor levels down into the 45–50 dB(A) comfort range. The result is a quieter, more professional environment that supports daily operations.
