Power-Flow HVAC Silencers

Key Features & Benefits

Power-Flow Silencers meet the highest standards for heavy-duty air and gas handling systems.
Field-tested in thousands of installations for reliable, long-term noise control.
Available in modular rectangular or tubular designs, tailored to solve noise challenges in any heavy-duty flow system.
Each design is rigorously tested and validated by NVLAP-accredited independent facilities.
Backed by ongoing R&D, IAC continually enhances and customizes silencers to meet evolving industry-specific requirements.

Typical Applications

Power Plants
Gas Turbines
Test Facilities
Cooling Towers
Steel Mills
Wind Tunnels

Forward and Reverse Flow

In 1972, IAC developed silencer Dynamic Insertion Loss and Self-Noise ratings both under FORWARD FLOW (+) and REVERSE FLOW (-) conditions for Rectangular and Cylindrical Duct Attenuators. Since attenuation values are generally higher in the first five octave bands in the Reverse Flow (-) mode compared to the Forward Flow (+) mode, more economical silencer selections can often be made on return air systems. These phenomena are illustrated below.

Forward Flow occurs when air and sound waves travel in the same direction, as in an air conditioning system or fan discharge. Under forward flow conditions, high frequency sound is refracted into the duct silencer walls.

Reverse Flow occurs when air and sound waves travel in opposite directions, as in a typical return-air system. Under reverse flow conditions, sound is refracted away from the walls and towards the center of the duct silencer.

Download These Documents For Details

Power Flow Silencer Catalog

"Diagram of Rectangular Power-Flow Silencer components and features."

Power Flow Rectangular Silencers

Power-Flow silencers are available in any size required for your applications. Assemblies as large as 25’ high x 250’ wide are in continuous operation. Special silencer configurations available to meet the most demanding insertion loss and low self noise requirements. Silencers in light gauge construction also available.

Alt text: Diagram of Tubular Power-Flow Silencer components and features.

Power Flow Tubular Silencers

Power-Flow silencers are custom sized to fit any application. Assemblies as large as 20' in diameter are in continuous operation. Special silencer configurations available to meet the most demanding insertion loss and low self noise requirements. Silencers in light gauge construction are also available.