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Large HVAC systems produce continuous low-frequency noise that travels through ductwork and building structures. The most effective solution is installing a high-mass acoustic barrier on ducts, enclosures, or surrounding structures. In New York, facilities must comply with OSHA limits of 85 dB.
The Hum That Travels Through the Building
In large facilities, HVAC noise isn’t just background—it becomes part of the environment.
Operating at 70–90 dB, these systems generate a deep, low-frequency hum that doesn’t stay in the mechanical room. Instead, it moves through:
- Ductwork acting as sound channels
- Structural connections between rooms
- Walls, ceilings, and mechanical pathways
What begins at the air handling unit often spreads across offices, corridors, and adjacent spaces.
Why HVAC Noise Is Hard to Contain
HVAC systems create continuous noise that follows multiple transmission paths.
- Ducts carry sound across long distances
- Structural vibration spreads through connected systems
- Standard insulation focuses on temperature—not sound blocking
This is why noise persists even after basic treatments are installed.
The Right Solution: Add Mass Where It Matters
To stop HVAC noise, you need to block it—not just absorb it.
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Recommended System
MassiCore® Marine 135 (ANC-MB135)
- 2 lb mass loaded vinyl barrier for high-density blocking
- Effective for low-frequency HVAC noise
- Flexible for duct wrapping and enclosure systems
- Designed for commercial and industrial environments
Instead of reducing echo, it prevents sound from traveling through ducts and structures.
How It’s Installed
For best performance, apply as a continuous system:
- Wrapped directly around HVAC ductwork
- Installed in mechanical room enclosures
- Used in barrier curtain systems around equipment
- Fully sealed to eliminate sound leaks
This creates a complete acoustic barrier system across HVAC pathways.
Measured Results in Real Facilities
With proper installation:
- Noise reduced from 85–90 dB → 60–65 dB
- Improved acoustic comfort in occupied spaces
- Reduced noise transfer between rooms
Supports OSHA standards in New York:
- 85 dB (Action Level)
- 90 dB (Permissible Exposure Limit)
How do you reduce HVAC low-frequency noise?
- Install a mass loaded vinyl barrier on ducts and enclosures
- Seal all gaps and connections
- Block transmission paths through structure
HVAC noise doesn’t stay in the mechanical room—it travels.
To control it effectively, you need:
- High-mass acoustic barrier (MLV system)
- Continuous duct and enclosure coverage
Compliance with OSHA standards
MassiCore® Marine 135 provides a proven solution for controlling low-frequency HVAC noise in large-scale facilities.
