Experts in Building Environments™

Active Noise Control — The Most Efficient, Compact Solution for Inlet Sound Control

Active Noise Control — The Most Efficient, Compact Solution for Inlet Sound Control
Active Noise Control — The Most Efficient, Compact Solution for Inlet Sound Control

Our patent-pending active noise control component — innovated for FANWALL® air handling systems — is the most compact option for added control of inlet sound on the market. We use active noise cancellation to provide up to 22 dB reduction in sound power at the troublesome blade pass frequency in lower octave bands.

Each active noise control module is attached to the FANWALL cube inlet, requiring minimal cabinet depth. The factory-installed system self-calibrates upon startup, requiring no additional field installation or commissioning beyond low-voltage power wiring.

Active noise control is available with the FANWALL system backdraft damper or in a free-inlet configuration. The bolt-on design makes it possible to install active noise control modules in existing FANWALL systems with available inlet space, as well.

Success Story — The Robert C. Levy Tunnel

Issue

The Robert C. Levy Tunnel is a high-capacity conduit for traffic between North Beach and Russian Hill in San Francisco. Air handlers provide fresh air inside the tunnel for motorists, pedestrians, and cyclists. The fans are located in large equipment rooms that draw in air through louvers on each end of the tunnel. In order to replace the original fans in the tunnel, residents of the adjacent neighborhoods required the new fan system be no louder, or even quieter, than the old fans.

Solution

Two FANWALL TECHNOLOGY® fan arrays with active noise control replaced the original 1950s vintage fans installed in the tunnel; 24 cubes provide 150,000 cfm and 9 cubes provide 53,000 cfm.

Result

The active noise control system on the fan arrays reduced the fan noise on the inlet side by 20 dB compared to the old fans, making the sound almost imperceptible to nearby residents.

Schermerhorn Symphony Center - Nashville, TN

The Schermerhorn Symphony Center replaces flood-damaged air handlers with FANWALL® equipped Knockdown Units, providing protection from future flood damage.

Read the case study.
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